2024-03-28T11:24:48Zhttp://i-rep.emu.edu.tr:8080/oai/request
oai:i-rep.emu.edu.tr:11129/1262012-12-25T14:29:32Zhdl_11129_125Effect of the Dilaton Field on the Entropic ForceFarahi, AtenaPhysicsSpaceEntropic Force - Holographic Screen - Dilaton Field - Emergent GravityAccording to the Eric Verlinde’s arguments on the gravity, we study the entropic force of two spacetimes without and with dilaton field, which are the Schwarzschild black hole and the charged dilaton black hole respectively. Generally, the existence of the dilaton field makes over the spacetime to have unusual asymptotic structure. During the calculations of the entropic force, the key point is to describe the holographic screen of the associated spacetime. In this thesis, we mainly consider three surfaces as being candidates for the holographic screen. These surfaces are called as the static holographic screen, the accelerating surface and the stretched horizon. Thus, by comparing the results of the entropic force of the associated spacetimes, we want to stress the effect of the dilaton field on the entropic force.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2011. Supervisor: Assoc. Prof. Dr. İzzet Sakallı.Eastern Mediterranean University (EMU)2012-12-03T09:09:47Z2012-12-03T09:09:47Z2011ThesisFarahi, Atena. (2011). Effect of the Dilaton Field on the Entropic Force. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/126en
oai:i-rep.emu.edu.tr:11129/2042012-12-26T07:36:14Zhdl_11129_125Quantum Singularities in (2+1) Dimensional Matter Coupled Black Hole SpacetimesÜnver, ÖzlemPhysicsSpace and TimeQuantum Singularity - Naked Singularity - 2 1Dimensional SpacetimesABSTRACT: Quantum singularities are considered in matter coupled 2+1 dimensional spacetimes in Einstein’s theory. The occurrence of naked singularities in the spacetimes both in linear and non-linear electrodynamics in Einstein-Maxwell as well as in the Einstein-Maxwell-Dilaton gravity and pure magnetic Einstein-Power-Maxwell theory are considered. It is shown that the inclusion of the matter fields changes the geometry. The classical central singularity at turns out to be quantum mechanically singular for quantum particles obeying Klein-Gordon equation but nonsingular for fermions obeying Dirac equation in all space times except the class of static pure magnetic spacetime. The physical properties of the 2+1 dimensional magnetically charged solutions in Einstein-Power-Maxwell theory with particular power of the Maxwell field are investigated. The true timelike naked curvature singularity develops when which constitutes one of the striking effects of the power Maxwell field. For specific power parameter, the occurrence of timelike naked singularity is analysed in quantum mechanical point of view. It is shown that the class of static pure magnetic spacetime in the power Maxwell theory is quantum mechanically singular when it is probed with fields obeying Klein-Gordon and Dirac equations in the generic case.
Keywords: Quantum singularity, naked singularity, 2+1 dimensional spacetimes.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Einstein teorisi içinde, kuvantum tekillikleri madde eklenmiş 2+1 boyutlu uzay-zamanlarda çalışılmıştır. Çıplak tekilliklerin oluşumu doğrusal ve doğrusal olmayan elektrodinamik Einstein-Maxwell, hem de Einstein-Maxwell-Dilaton ve manyetik Einstein-Üslü-Maxwell teorilerinde incelenmiştir. Madde alanlarının eklenmesiyle geometrinin değiştiği gösterilmiştir. Statik manyetik uzay-zaman haricindeki tüm çalışılan uzay-zamanlarda noktasındaki klasik merkezi tekilliğin Klein-Gordon denklemine uyan parçacıklar için kuvantum tekil kaldığı fakat Dirac denklemine uyan fermionlar için bu tekilliğin ortadan kalktığı görülmüştür.
Einstein-Üslü-Maxwell teorisinde 2+1 boyutlu manyetik yüklü çözümlerin fiziksel özellikleri özel k kuvvetiyle incelenmiştir. değerleri için zamansal, çıplak, eğrilik tekilliğinin oluştuğu görülmüştür ki bu durum üslü Maxwell alanının en büyük etkisidir. Belli bir k değeri için kuvantum mekaniksel açıdan zamansal çıplak tekilliğin oluşumu incelenmiştir. Üslü Maxwell teorisindeki statik manyetik uzay-zamanın Klein-Gordon ve Dirac alanları içerisinde incelendiğinde, kuvatum mekaniksel olarak tekil kaldığı gösterilmiştir.
Anahtar Kelimeler: Kuvantum tekillik, çıplak tekillik, 2+1 boyutlu uzay-zamanlar.Doctor of Philosophy in Physics. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2012. Supervisor: Prof. Dr. Özay Gürtuğ.Eastern Mediterranean University (EMU)2012-12-12T13:04:01Z2012-12-12T13:04:01Z2012ThesisUnver, Ozlem. (2012). Quantum Singularities in (2+1) Dimensional Matter Coupled Black Hole Spacetimes. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/204en
oai:i-rep.emu.edu.tr:11129/2652013-01-05T00:00:24Zhdl_11129_125Tunneling TimesEser, Muhittin CenkPhysicsQuantum MechanicsQuantum Mechanics - Traversal Time - Tunneling Time - Larmor Clock - Dwell TimeABSTRACT: The tunneling time problem was a very popular problem at the end of the 20th century.In Quantum Mechanics only observables can be measured, i.e. these observables are real quantities. From mathematics it is well known that only hermitian operators have real eigenvalues, therefore we associate observables as eigenvalues of Hermitian operators. Until now no Hermitian operator for the time was not found. Therefore many approaches in order to determine the time a particle spends in a region or needs to travel across a region are developed. Based on this the Bohmian Dwell Time, the Buttiker Landauer Time, the Larmor Clock, and the minimal tunneling time are presented and discussed in this thesis.
Keywords: Quantum Mechanics, Traversal Time, Tunneling Time, Larmor Clock, Dwell Time.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Tünelleme zamanı problemi yirminci yüuzyılın sonunda çok popüuler araştırma alanıydı.
Kuantum mekanikte sadece göorünebilirler ölçülebilir, yani bu görünebilirler reel bir değerdir. Matematikten bilinir ki Hermityan opertörlerin özdeğerleri reel sayıdır, ve bundan dolayı görünebilirleri Hermityan operatörlerin özdeğerleri ile ilişkilendirilir. Şimdiye kadar kuantum fiziksel zaman kavramı için Hermityan operatör bulununamadı. Dolayısı ile kuantum mekanite zaman kavramını, yani bir parçacığın bir bölgede geçirdiği veya bir bölgeyi geçmek için harcadığı zamanı, tanımlamak amacı ile farklı yaklaşımlar geliştirildi. Buna bağlı olarak Bohm kalma zamanı, Büttiker Landauer zamanı, Larmor saatı, ve minimal tünelleme zamanı yaklaşımları bu tezde veriliyor ve tartışılıyor.
Anahtar Kelimeler: Kuantum Mekanik, Geçme Zamanı, Tünelleme Zamanı, Larmor Saati, Kalma Süreci.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Science, Dept. of Physics, 2011. Supervisor: Assist. Prof. Dr. Mustafa Rıza.Eastern Mediterranean University (EMU)2013-01-04T08:48:16Z2013-01-04T08:48:16Z2011ThesisEser, Muhittin Cenk. (2011). Tunelling Times. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/265en
oai:i-rep.emu.edu.tr:11129/3292013-01-11T00:00:28Zhdl_11129_125Information Loss Problem in Linear Dilaton Black HolesPaşaoğlu, HalePhysicsQuantum - PhysicsLinear Dilaton Black Holes - Hawking Radiation - Information Loss Paradox - Entropy Conservation - Quantum CorrectionsABSTRACT: Using the Damour-Ruffini-Sannan and the Parikh-Wilczek methods, we analyze the Hawking radiation of uncharged massive particles for linear dilaton black holes with N ≥ 4 dimensions. Contrary to the many studies in the literature in which the original Parikh-Wilczek’s method are used, our results show that the obtained emission spectrum is precisely thermal. This implies that sole back-reaction effects do not retrieve the information from the linear dilaton black holes. On the other hand, when we recalculate the emission probability by taking into account the log-area quantum correction to the black hole entropy, it is seen that the radiation deviates from its pure thermal behavior. Besides, the quantum corrections give rise also to the statistical correlation between quanta emitted. The latter results yield that the information can leak out of the linear dilaton black holes together with preserving unitarity in quantum mechanics. In addition to these, we extend our study to the case in which quantum gravity ħ corrections in all orders in are considered. The obtained modified entropy and temperature are adjusted so finely that the scenario of fading Hawking radiation, in which both entropy and temperature vanish with zero mass, becomes possible. Finally, we highlight that, even in the case of fading Hawking radiation, the linear dilaton black holes could evaporate completely with conserving the total entropy - “no information loss”.
Keywords: Linear dilaton black holes, Hawking radiation, information loss paradox,
entropy conservation, quantum corrections.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Damour-Ruffini-Sannan ve Parikh-Wilczek yöntemleri kullanarak, N ≥ 4 boyutlu lineer dilaton kara delikler için yüksüz kütleli parçacıkların Hawking radyasyonunu analiz ettik. Orjinal Parikh-Wilczek yönteminin kullanıldığı literatürdeki pek çok çalışmanın aksine elde edilen sonuçlar, emisyon spektrumunun tam ısıl olduğunu göstermektedir. Bu ise tek başına geri -reaksiyon etkisinin lineer dilaton kara deliklerinden bilgi çıkaramayacağını işaret etmektedir. Diğer taraftan, emisyon olasılığını, kara deliğin entropisine log-alan kuantum düzeltmesini dikkate alarak yeniden hesapladığımız zaman, radyasyonun saf ısıl davranışında sapma olduğu görüldü. Bunun yanında kuantum düzeltmeleri, yayılan kuantalar (kuantum parçacıkları) arasında istatistiksel bir ilişkinin de oluşmasına neden olmuştur. Son sonuçlar bilginin, kuantum mekaniğindeki üniterliği koruyarak lineer dilaton kara deliklerinden sızacağını göstermektedir. Bunlara ek olarak, çalışmamızı kuantum düzeltmelerini ħ’ın tüm derecelerini içerecek şekilde genelledik. Elde edilen değiştirilmiş entropi ve sıcaklığa, sıfır kütle ile biten entropi ve sıcaklığa sahip sönümlü Hawking ışımasını mümkün kılacak şekilde ince bir ayar yaptık. Son olarak, sönümlü Hawking ışıması durumunda dahi lineer dilaton kara deliklerinin toplam entropiyi koruyarak - bilgi kayıpsız - tamamen buharlaşabileceğini vurguladık.
Anahtar Kelimeler: Entropi, lineer dilaton kara delik, Hawking ışıması, kuantum düzeltmeleri.Doctor of Philosophy in Physics. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2012. Supervisor: Prof. Dr. Mustafa Halilsoy.Eastern Mediterranean University (EMU)2013-01-10T13:34:31Z2013-01-10T13:34:31Z2012ThesisPasaoglu, Hale. (2012). Information Loss Problem in Linear Dilaton Black Holes. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/329en
oai:i-rep.emu.edu.tr:11129/6052013-08-12T23:00:25Zhdl_11129_125Nonlinear Electromagnetics in Flat and Curved SpacetimeAlizadeh, YasharPhysicsElectromagnetism.Born-Infeld - NED - Non-Linear Lagrangian - Black Hole SolutionABSTRACT: In the framework of the non-linear electrodynamics, we introduce a new Lagrangian with Maxwell limit which admits a regular electric field and electric potential at the origin. In static spherically symmetric spacetime we couple non-minimally the latter Lagrangian with the gravity in 3, 4 and higher dimensions separately to find the black hole solutions. We emphasize in this thesis that this new Lagrangian is easier to be used in some practical cases such as hydrogen atom due to the simple form of the
electric potential of a point charge.
Keywords: Born-Infeld, NED, Non-linear Lagrangian, Black hole solution.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Doğrusal olmayan elektrodinamik kapsamında Maxwell limitine sahip, merkezde düzenli
elektrik ve potansiyel alan içeren yeni bir Lagrange fonksiyonu sunuluyor. Statik, Küresel simetrik uzayda yerçekimine minimal olmayan şekilde bağlanan 3 ve 4 boyutlu uzaylarda karadelik çözümleri elde ediliyor. Sunduğumuz modelin birçok bakımdan örneğin hidrojen atom model potansiyeli gibi, daha kullanışlı olacağına vurgu yapılıyor.
Anahtar Kelimeler: Born-Infeld, NED, Doğrusal olmayan Lagrange fonksiyonu, Karadelik Çözümleri.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2012. Supervisor: Assist. Prof. Dr. S. Habib Mazharimousavi.Eastern Mediterranean University (EMU)2013-08-12T08:07:11Z2013-08-12T08:07:11Z2013ThesisAlizadeh, Yashar. (2013). Nonlinear Electromagnetics in Flat and Curved Spacetime. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/605en
oai:i-rep.emu.edu.tr:11129/6422013-08-14T23:00:36Zhdl_11129_125Dark Matter; Modification of f (R) or Wimps MiracleÖvgün, AliPhysicsDark Matter (Astronomy)Cosmology - PhysicsDark Matter - Weakly Interacting Particles (WIMPs) - f (R) Gravity - CosmologyABSTRACT: The identity of dark matter is one of the key outstanding problems in both particle and astrophysics. In this thesis, I review some candidates of dark matter, especially WIMPs (weakly interacting massive particles) which is one of the best candidate so it is called that WIMPs miracle. In addition of this, there are also some theories of modification of gravity, by changing the law of gravity, it could be possible that the dark matter observations are explained. Until the dark matter particle is detected, there is some room for uncertainty. So we should consider every part of the problem and solve it. Dark matter problem is covering a large area so every possibility is important. So f (R) gravity is also reviewed in this thesis and some theories are considered as a possible solution of dark matter problem. Finally we highlight that, even in the case of WIMPs or another particles solution, f (R) gravity is also can be used for this problem. However, last words will be said by experiments. Keywords: Dark Matter, Weakly Interacting Particles(WIMPs), f (R) Gravity, Cosmology.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Karanlık Maddenin gizemi hem astrofizik hem de parc¸acık fiziği açısından çok önemli bir problemdir. Bu tezde, karanlık madde adaylarını, özellikle WIMPs mucizesi olarak bilinen ve en güçlü aday olan WIMPs (zayıf etkiles¸en kütleli parçacık)i inceledim. Karanlık Maddenin gizemini cözmeye çalışan bundan başka teoriler de vardır, örneğin gravitasyonun modifiye edilmesi gibi. Karanlık madde parçacıkları deneylerde bulunana kadar, bu gizem sürecektir. Biz bu gizemi her açıdan inceleyip çözüm üretmemiz gerekir çünkü çok geniş bir alanı kapsayan bu alan için her bir ihtimal bile çok önemlidir. Karanlık maddeyi açıklamaya aday olan f (R) gravitasyon teorisini de bu tezde inceledik ve çözüm üretmeye çalıştık. Sonuç olarak, gerek WIMPs olsun gerekse bas¸ka parçacıklar olsun, f (R) gravistasyon teorisi de güzel bir alternatiftir ve kullanılabilir. Tabii hangisinin doğru olduğunu deneyler onaylaycak.
Anahtar Kelimeler: Karanlık Madde, Zayıf Etkileşen Kütleli Parçacıklar (WIMPs), f (R) Gravistasyon Teorisi, Kozmoloji.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2012. Supervisor: Prof. Dr. Mustafa Halilsoy.Eastern Mediterranean University (EMU)2013-08-14T06:01:07Z2013-08-14T06:01:07Z2013ThesisOvgun, Ali. (2013). Dark Matter; Modification of f (R) or Wimps Miracle. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/642en
oai:i-rep.emu.edu.tr:11129/6472013-08-14T23:00:51Zhdl_11129_125Self-adjoint Extensions of the Operators and Their Applications in PhysicsEmral, KıymetPhysicsOperator Theory - Selfadjoint Operators - Hilbert SpaceABSTRACT: In this thesis, self-adjoint extensions of some of the operators used in quantum mechanics are studied. First, the necessary mathematical background namely, the vector spaces and Hilbert space are reviewed. Secondly, the theorem of von-Neumann is introduced to determine the self-adjoint extension of the operators. The application of self-adjoint extensions of the momentum and spatial part of the Klein-Gordon equation is investigated. The concept of quantum singularity structure of the negative mass Schwarzchild spacetime is investigated by the wave obeying the Klein-Gordon equation.
Keywords: Self-adjoint extensions, Hilbert-space, von-Neumann Theorem, Klein-Gordon equation.
……………………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu tezde, kuantum mekaniğinde kullanılan bazı operatörlerün kendi eşlenik uzantıları ele alınmıştır. İlk olarak, gerekli matematiksel altyapı olan, vektör uzayları ve Hilbert uzayı gözden geçirilmiştir. İkinci olarak ise, operatörlerin kendi eşlenik uzantılarını belirlemek için kullanılan von-Neumann teoremi tanıtılmıştır. Daha sonra uygulama olarak Momentum operatörü ve Klein-Gordon denkleminin uzaysal kısmının kendi eşlenik uzantıları incelenmiştir. Son olarak negatif kütle Schwarzschild uzay-zamanın kuantum tekillik yapısı Klein-Gordon denklemine uyan dalgalar için incelenmiştir. Anahtar Kelimeler: Kendi eşlenik uzantısı, Hilbert uzayı, von-Neumann Teoremi, Klein-Gordon denklemi.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2012. Supervisor: Prof. Dr. Özay Gürtuğ.Eastern Mediterranean University (EMU)2013-08-14T06:48:37Z2013-08-14T06:48:37Z2013ThesisEmral, Kiymet. (2013). Self-adjoint Extensions of the Operators and Their Applications in Physics. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/647en
oai:i-rep.emu.edu.tr:11129/12602014-06-16T23:00:30Zhdl_11129_125Stability of Thin-Shell wormholesAmirabi, ZahraPhysics - Space and TimeGeneral Relativity (Physics)Black HolesBlack Hole - Wormholes - Thin-Shell - Norman Matter - Exotic Matter - StabilityABSTRACT: The concept of thin-shell wormholes has been considered in Einstein’s theory of gravity coupled with different matter sources likeMaxwell, Yang-Mills, Born-Infeld-
Hoffman fields, generalized Chaplygin gas and dilaton. Our consideration is in higher
dimensions where the bulk spacetime is introduced there. We mainly concentrate on
the stability of possible thin shell wormholes and the amount of normal or exotic
matter needed to support such kind of wormholes. In addition to the Einstein Gravity
(i.e General Relativity) we also consider the Gausse-Bonnet gravity which is an
extension of Einstein’s gravity. This extended version of general relativity enabled
us to construct thin-shell wormholes which are supported by normal matter. Most of
our calculations are numeric together with some plots. The results given in this thesis
are published during the recent years.Doctor of Philosophy in Physics. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2012. Supervisor: Prof. Dr. Mustafa Halilsoy.Eastern Mediterranean University (EMU)2014-06-16T08:34:13Z2014-06-16T08:34:13Z2012-08ThesisAmirabi, Zahra. (2012). Stability of thin-shell wormholes. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1260en
oai:i-rep.emu.edu.tr:11129/13022014-09-15T23:00:30Zhdl_11129_125Klein - Gordeon equation in 1+1 - DimensionsSulaiman, Rafea IsmaelPhysicsRelativistic Quantum TheoryKlein - Gordon equationKlein - Gordon Equation, Heun Functions, 1+1- dimensions, Particle in infi-nite wellABSTRACT: In this study we give a brief introduction to the basic differential equation for zero spin relativistic particle which is called Klein-Gordon equation. Klein-Gordon equation, then, is presented in 1+1-dimensions where we give some exact solutions for the equation with different potentials. The first problem is the particle inside a potential of the form of smooth finite well. We find the exact solutions in terms of the Heun functions. Our second example is a K-G particle inside an infinite well whose wall is moving. This problem is solved for massless particle. Finally, we give the remarks in our conclusion.
Keywords: Klein-Gordon equation, Heun functions, 1+1-dimensions, Particle in infi- nite well.
………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu çalışmada, Klein – Gordon denklemi olarak bilinen, sıfır spine sahip rölativistik parçacık için temel diferansiyel denkleme, kısa ve öz bir giriş yapılmıştır. Klein – Gordon denklemi, farklı potansiyellere sahip bir denklem için, bazı kesin çözümler verdiğimiz 1 + 1 boyutları ile sunulmuştur. İlk soru, pürüzsüz sonlu kuyunun bir formu olan bir potansiyelin ic¸indeki parc¸acıkla ilgilidir. Kesin çözümler, Heun fonksiyonları cinsinden bulunmuştur. İkinci örneğimiz ise duvarı hareket halinde olan sonsuz bir kuyu içindeki KG parçacığıdır. Bu soru kütlesiz parçacık için çözülmüştür. Son olarak, sonuç kısmında yorumlara yer verilmiştir.
Anahtar Kelimeler: Klein - Gordon denklemi, Heun fonksiyonları, 1 + 1 boyutları, sonsuz kuyu içerisindeki parçacık.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Assoc. Prof. Dr. S. Habib Mazharimousavi.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-09-15T07:29:31Z2014-09-15T07:29:31Z2014-01ThesisSulaiman, Rafea Ismael. (2014). Klein - Gordeon equation in 1+1 - Dimensions. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1302en
oai:i-rep.emu.edu.tr:11129/13092014-09-15T23:00:47Zhdl_11129_125Seismic AVO attributes and rock Physics in hydrocarbon explorationJalali, VajihehPhysicsPetroleum - Geology - Arctic regionsAVO Technique, AVO Attribute, Hydrocarbon Exploration, Gas Reservoir, Pre-Stack Seismic Data, Rock Physics, Reflection SeismologyABSTRACT: During past two decades amplitude variation with offset (AVO) is a known technique that has been used in direct hydrocarbon exploration and exploitation, which uses the amplitudes of pre-stack seismic data to improve the reservoir forecasting in petroleum industry. There are significant number of studies in literature that incorporate with AVO analysis and inversion technique, especially in gas reservoirs to improve the risk assertion.
In this thesis, we apply AVO technique to map the attribute anomalies of the reservoir to survey the capability of AVO technique to indicate the exact location of the gas zones in approved hydrocarbon reservoir using the well log and seismic data with 2-D seismic interpretation method.
Keywords: AVO Technique, AVO Attribute, Hydrocarbon Exploration, Gas Reservoir, Pre-Stack Seismic Data, Rock Physics, Reflection Seismology.
…………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Son yirmi yılda, genlik karşı offset (AVO) tekniği, hidrokarbon kaynaklarının keşif araştırmalarında ve kullanılmasında uygulanan bir teknik olarak bilinmektedir. Bu teknik, petrol endüstrisinde, rezerv kaynakların tesbit edilmesi aşamasında sismik veri yığınlarının iyileştirilmesi amacıyla geliştirilmiştir. Literatürde, AVO analizi ve ters tekniği ile ilgili önemli sayıda çalışma, doğal gaz yataklarının araştırılmasındaki risk faktörünün iyileştirilmesi amacıyla kullanılmıştır.
Bu tezde, AVO tekniği uygulanarak, bu tekniğin doğal gaz bölgelerinin tesbitindeki kullanılabilirliği, 2- boyutlu well log – sismik veri analiz yöntemiyle irdelenmiştir.
Anahtar Kelimeler: AVO tekniği, AVO vasfı, Hidrokarbon keşfi, Doğal gaz rezervi, ön-yığılmalı sismik veri, Kaya fiziği, Yansıma sizmolojisi.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Prof. Dr. Özay Gürtuğ.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-09-15T10:44:20Z2014-09-15T10:44:20Z2014-01ThesisJalali, Vajiheh. (2014). Seismic AVO attributes and rock Physics in hydrocarbon exploration. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1309en
oai:i-rep.emu.edu.tr:11129/13332014-09-17T23:00:57Zhdl_11129_125To what extent do engineering students master and retain an understanding of newtonian mechanics throughout their university lifeAbdal Razzaq, Eman HameedPhysicsMechanics, PhysicsForce and EnergyForce Concept Inventory, Correct Answer, Language, Item AlalysisABSTRACT: This research is to assess the conceptual understanding of towards learning Physics courses for master and undergraduate students among the first year and final year. The study examined engineering undergraduates (N = 272) and master students (N=10) for one year at EMU for 2012/2013 session. This is a descriptive quantitative research. Data was collected by using one instrument, namely the Force Concept Inventory (FCI). The data collected was analyzed by using three software package programs SPSS version 20.0, TAP version 12.9.23 and Stat disk version 12.0.2. The findings show that the mean scores obtained by the students „master and undergraduates” in FCI was 27.8%. The results indicate that there is no statistically significant difference between correct answered and “year, age, CGPA, and program”. This means there are no factors affecting on the correct answers of students in EMU. Also the results show that the Mean score for masters students is (M=30.3%), while the Mean score for undergraduate students is (M=26.6%). However, the results indicate that poor conceptual understanding due to misconceptions is detected among students. Keywords: Force Concept Inventory, Correct answer, Language, and Item analysis.
…………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu araştırma birinci ve dördüncü sınıf mühendislik öğrencilerinin Newton mekaniğinin kavramsal anlayışını ölçmeyi amaçlamaktadır. Çalışma Doğu Akdeniz Üniversitesinde, 2012–13 Bahar döneminde 282 öğrenci üzerinde gerçekleştirilmiştir. Bu çalışma tanımlayıcı nicel bir araştırmadır. Bu çalışmada temel veriler, Hestenes ve arkadaşları tarafından tasarlanan Kuvvet Kavramı Ölçeği ( FCI ) enstrümanı ile toplandı. Test öğrencilere İngilizce Türkçe, Arapça ve Farsça olarak dört farklı dilde sunuldu. Ayrıca, her öğrencinin bazı kişisel verileri de toplandı. Bu veriler öğrencinin yaşı, akademik yılı, kayıtlı olduğu programı, başlangıç Fizik, Kimya ve Matematik derslerinde aldığı not ve genel not ortalaması (CGPA) gibi bilgilerdir. Toplanan veriler SPSS sürüm 20.0, TAP sürüm 12.9.23 ve Statdisk sürüm 12.0.2 kullanılarak istatistiksel olarak analiz edildi. Bulgular öğrencilerin FCI testindeki genel başarılarını ortalama olarak yüzde 27,8 olarak göstermektedir. Ayrıca verilerin analizi FCI testinde gösterilen başarının katılımcıların ' testte seçtikleri dil, eğitim-öğretim yılı, yaş, genel not ortalaması, fen derslerinde almış oldukları not, sınıf ve kayıtlı oldukları program gibi faktörlerden hiç etkilenmediğini, aralarında istatistiksel olarak anlamlı bir ilişkinin bulunmadığını göstermektedir. Bu sonuç, öğrencilerin test başarılarını etkileyen herhangi bir faktör/parametrenin bulunamadığı anlamına gelir. Literatürdeki benzer çalışmalar ile karşılaştırdığımızda, öğrencilerimizin testteki başarıları genelde daha düşüktür. Test sonuçları örneklenen öğrenci gurubunun Newton mekaniğin kavramsal anlayışının zayıf olduğunu ve öğrencilerin konu hakkında yanlış kanılara sahip olduklarını göstermektedir
Anahtar Kelimeler: Kuvvet Kavramı Ölçeği, Doğru cevap, Dil, ve madde analizi.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Assist. Prof. Dr. Mehmet Garip.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-09-17T12:04:49Z2014-09-17T12:04:49Z2014-02ThesisAbdal Razzaq, Eman Hameed. (2014). To what extent do engineering students master and retain an understanding of newtonian mechanics throughout their university life. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1333en
oai:i-rep.emu.edu.tr:11129/13412014-09-19T23:00:50Zhdl_11129_125Physics on the rotating EarthSaleh, Najm AbdolaPhysicsCoriolis and Centrifugal Force, Foucault PendulumABSTRACT: In this thesis we study physics on the rotating Earth by studying the moving coordinate systems and rotating coordinate systems. First, we illustrate briefly some kind of translations like Galilean transformation which consists of two inertial frames, one of them moving with respect the other stationary We show how to transform between the two reference frames. Then we give the Lorentz transformations in which time is no more absolute when the speed approaches to the speed of light. We review Abelian and Non-Abelian groups. But then we will focus on the Newton’s equations of motion on the Earth and we will explain in details the derivation of these equations. We derive both the Coriolis and centrifugal forces.
Later on we explain some applications about rotating Earth. The most important example is a projectile motion. We illustrate by derivation how it is the best way to show the reason of the deflections of missiles in long range distances. Another famous example is the Foucault pendulum, which is an important example to prove that the Earth is rotating about its axis. And finally, we give some applications to show the effect of Coriolis and centrifugal forces in our daily life. Keywords: Coriolis and Centrifugal Force, Foucault Pendulum.
…………………………………………………………………………………………………………………………………………………………………………………………………………ÖZ: Hareketli ve dönen koordinat sistemlerinin dünya üzerindeki fiziğe etkileri incelenmiştir.Önce birbirine göre hareketli Galile koordinat sistemleri göz önüne alınmıştır.İki koordinat sistemi arasındaki dönüşüm verilmiştir.Işık hızına yakın durumlarda, ki zamanın mutlak özelliği geçersiz olur Lorentz dönüşümleri ele alınmıştır. Abel/ Abel olmayan gruplar gözden geçirilmiştir.Dönen dünya üzerindeki Newton hareket denklemleri ile Coriolis ve merkezkaç kuvetler türetilmiştir. Fırlatılmış cisimlerde dönmenin etkileri incelenmiştir. Uzun menzilli roket hareketindeki sapmalar iyi bir örnek olarak ele alınmıştır .Foucauft sarkacı dünyanin dönme etkisine başka bir önemli örnek teşkil etmekte olup dünyanın dönüşünü de kanıtlamaktadır.Coriolis ve merkezkaç kuvetlerinin günlük hayatımızdaki örnekleri irdelenmiştir.
Anahtar Kelimeler: Coriolis ve Merkezkaç Kuvetleri, Foucault Sarkacı.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2013. Supervisor: Prof. Dr. Mustafa Halilsoy.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-09-19T10:31:16Z2014-09-19T10:31:16Z2013-06ThesisSaleh, Najm Abdola. (2013). Physics on the rotating Earth. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1341en
oai:i-rep.emu.edu.tr:11129/13552014-09-26T23:00:46Zhdl_11129_125Existence of reissner - nordström type black hole in f (R) gravityKerachian, MortezaPhysicsBlack holes - Mathematical modelsReissner - Nordström, f(R Gravity; Black Hole Thermodynamics)ABSTRACT: We investigate the existence of Reissner-Nordström (RN) type black holes in f (R) gravity. Our emphasis is to derive, in the presence of electrostatic source, the necessary
conditions which provide such static, spherically symmetric (SSS) black holes available in f (R) gravity by applying the ”near horizon test” method. In this method we expand all the unknown functions about the horizon and we obtain zeroth and first terms of these fuctions. We also study the Extremal RN type black hole in this framework. In this thesis we show that it seems impossible to have a closed form of f (R) for these types of black holes. Since, finding the total energy is rather difficult we derive the Misner-Sharp (MS) energy in f (R) gravity by using the properties of black hole thermodynamics. Keywords: Reissner-Nordström; f (R) Gravity; Black Hole Thermodynamics.
…………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: f (R) yerçekim modelinde Reissner-Nordström (RN) tipi karadelik çözümlerinin varlıgı
incelenmektedir. Statik elektrik kaynak durumunda static küresel simetrik çözümlere ”ufuk yanı testi” uygulayarak gerekli varlık şartları elde edilmiştir. Bilinmeyen fonksiyonlar ufuk civarında açılımlara tabi tutulup sıfır ve birinci mertebeden denklemler türetilmiştir. Özel bir hal olarak Ekstrem RN çözümünün varlığı da incelenmiştir. Bu tip kara deliklerin f(R) fonksiyonları kapalı bir formda elde edilememiştir. Kara delik termodinamiği kullanılarak Misner-Sharp (MS) türü enerji tanımı yöntemimizde esas alınmıştır.
Anahtar Sözcükler: Reissner-Nordström, f (R) Çekim Kuramı, Kara Delik Termodinamiği.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2013. Supervisor: Prof. Dr. Mustafa Halilsoy.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-09-26T05:59:45Z2014-09-26T05:59:45Z2013-07ThesisKerachian, Morteza. (2013). Existence of reissner - nordström type black hole in f (R) gravity. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1355en
oai:i-rep.emu.edu.tr:11129/13742014-10-01T23:00:37Zhdl_11129_125Gravitational lensingParsa, MarziehPhysicsGravitational lensesGravitationLen sing Effect, Einstein General Relativity, Schwarzschild Black Hole, Grumiller Spacetime, Bardeen Black HoleABSTRACT: In this thesis we study one of the most interesting aspects of the Einstein’s theory of gravity which can be examined practically by astronomers. In this natural phenomena, when a beam of light passes nearby a heavy object, due to the gravity of the object the beam of light bends toward the center of the object which causes a deflection from its original path. This is much like a lens located in the path of the beam of light which deflects it and that is why it is called Lensing Effect. The implications of the theoretical results, even from the very beginning of the general relativity, have been realized by the astronomers where they could not explain many unusual observatory datas which could not be analyzed without considering this effect. Nowadays, applying the theory of lensing, helps us to localize the observed objects in the space surrounding our Earth. Therefore, our preliminary aim is to go through the theory of lensing by considering the general relativity concepts introduced by Einstein and developed by other great physicists. Next we apply the theory for some known spacetimes like the Schwarzschild black hole, the Grumiller spacetime and regular Bardeen black hole. To complete our assessment, we shall study lensing by a wormhole too. Keywords: Lensing Effect, Einstein General Relativity, Schwarzschild Black Hole, Grumiller Spacetime, Bardeen Black Hole.
…………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu tezde Einstein çekim yasasının astronomlar tarafından test edilebilecek bir özelliği
inceleniyor. Bir ışık hüuzmesi küutleli bir gök cismi yanından geçerken yer çekimine kapılıp bükülmektedir. Merceğin ışığgı saptırmasından ötürü bu olaya Mercek etkisi denmektedir. Bu etki göz önüne alınmadan pek çok uzay gözlemi yanıltıcı sonuçlar vermektedir. Son zamanlarda Mercek etkisi kullanılarak Düunya etrafındaki gök cisimlerinin yerleri doğru olarak tesbit edilmektedir. Bu tezde Mercek etkisinin ayrıntıları incelenmektedir. Schwarzschild, Grumiller ve tekilsiz Bardeen karadelik gibi iyi bilinen uzaylara bu etki uygulanmaktadır. Son olarak bir uzay solucan deliğinde de Mercek etkisi incelenmektedir.
Anahtar Kelimeler: Mercek Etkisi, Einstein Genel Görecelik Kuramı, Schwarzschild,
Grumiller ve Bardeen Solucan Uzayları.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2013. Supervisor: Assist. Prof. Dr. S. Habib Mazharimousavi.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-10-01T08:27:25Z2014-10-01T08:27:25Z2013-07ThesisParsa, Marzieh. (2013). Gravitational lensing. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1374en
oai:i-rep.emu.edu.tr:11129/13822014-10-02T23:00:39Zhdl_11129_125Position dependent mass quantum particleAl-Aakol, Ashwaq Eyad KadhimPhysicsQuantum PhysicsPosition Dependent Mass, Quantum Particle, Galilean Invariance, Instantaneous Galilean Invariance, Particle in Infinite WellABSTRACT: In this thesis we study a quantum particle with position dependent mass (PDM). We start from the general form of the kinetic energy operator in which the physical requirements are considered and then we show that the general form of the kinetic energy operator does not keep the Schrodinger equation invariant under the global Galilean transformation. To make out the problem we introduce instantaneous Galilean invariance and following this concept we show that in some specific case of the general form of the kinetic operator the Schrodinger equation remains invariant under the Galilean transformation. Furthermore we study a specific mass for a particle in an infinite square well potential. We show that the particle prefers to stay in a region with larger mass. Keywords: Position dependent mass, Quantum particle, Galilean invariance, Instantaneous Galilean invariance, Particle in infinite well.
…………………………………………………………………………………………………………………………………………………………………………………………………………
ÖZ: Bu tezde küutlesi pozisyona bağımlı bir kuantum partikülü incelenmektedir.Genel bir kinentik enerji operatörü ve dolayısıyle Schrödinger denklemi Galilei dönüşümü altında değişmektedir. Buna karşın anlık Galilei değişmezliğini Schrödinger denklmindeki kinetik enerjiye koyuyoruz. Sonsuz bir karesel kuyu potansiyelinde özel bir değişken kütle ele alınmakta ve partiküllerin ağır kütlesel noktaya çekildiği gözlemlenmektedir. Anahtar Kelimeler: Pozisyona Bağımlı kütle, Kuantum Zerresi, Galilei değişmezliği, Anlik Galilei değişmezliği, Sonsuz çukurda Zerre.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2013. Supervisor: Assist. Prof. Dr. S. Habib Mazharimousavi.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-10-02T10:46:05Z2014-10-02T10:46:05Z2013-09ThesisAl-Aakol, Ashwaq Eyad Kadhim. (2013). Position dependent mass quantum particle. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1382en
oai:i-rep.emu.edu.tr:11129/14882014-11-18T00:00:50Zhdl_11129_125New exact solutions in a model of f(R) gravity and their physical propertiesTahamtan, TayebehPhysicsGravity - PhysicsBlack Hole Solution f(R) Gravity Yang-Mills Linear and Nonlinear Electromagnetism Quantum SingularitiesABSTRACT: Some new exact solutions in a model of f (R) gravity are obtained. Three kinds of matter fields have been used to obtain exact analytic solutions. In the first solution,
the Yang-Mills fields are incorporated as a matter field at constant curvature condition.
In the second and third solutions, the linear and nonlinear electromagnetic fields are
used as matter fields. Thermodynamic properties are explored for those solutions that
admit black holes. The occurrence of naked singularities in the solutions sourced by
linear electromagnetic fields is investigated within the context of quantum mechanics.
The waves obeying the massless Klein-Gordon, Maxwell and Dirac fields are used
to probe the singularity. It is shown that the classical curvature singularity remains
singular even if it is probed with quantum waves rather than classical particles.
Keywords: Black hole solution, f(R) Gravity, Yang-Mills, Linear and Nonlinear Electromagnetism, Quantum singularities.Doctor of Philosophy in Physics. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2013. Supervisor: Prof. Dr. Özay Gürtuğ.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-11-17T13:57:24Z2014-11-17T13:57:24Z2013-06ThesisTahamtan, Tayebeh. (2013). New exact solutions in a model of f(R) gravity and their physical properties. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1488en
oai:i-rep.emu.edu.tr:11129/15212014-11-26T00:00:59Zhdl_11129_125Wave propagation in a medium with position-dependent permittivity and permeabilityRoozbeh, AshkanPhysicsElectromagnetismField theory (Physics)Mazharimousavi, HabibABSTRACT: The electromagnetic wave propagation in inhomogeneous media is studied. The wave equation in such a medium is obtained. By considering the permittivity as a positiondependent function (i.e, z-dependent) and the permeability as a constant (i.e, μ=kmμ0)
the wave equation is determined. The wave function is reported exactly in a medium with smooth step dielectric constant, in terms of hypergeometric function. The asymptotic behaviors of the wave function are examined and the reflection and transmission coefficients are found in perfect agreement with the previous results. Moreover, a smooth double layer case is studied and the corresponding wave function is presented and plotted exactly in terms of Heun function. Besides, the asymptotic behavior of the wave function is appointed. It is noticeable that the result of this thesis published in an international journal.
…………………………………………………………………………………………………………………………
ÖZ: Ayni cinsten (homojen) olmayan bir ortamda elektromagnetik dalga yayılması incelenmi
ştir. Böyle bir ortamda dalga denklemi inşa edilmiştir. Magnetik geçirgenlik katsayısı
(/mu) sabit, elektrik geçirgenlik katsayısı (/epsilon ) ise z- yönüne bağlı olduğu
durumda denklem çözülmüştür. Sürekli tek adım geçişli elektrik parameter durumunda
çözüm hipergeometrik fonksiyonlar cinsinden ifade edilmiştir. Kırılma ve geçirme
katsayıları önceki homojen durumlardakine indirgenecek şekilde tanımlanmıştır. Çift
adım geçişli ortam probleminde ise elektromagnetik dalga Heun fonksiyonları cinsinden
kesin olarak bulunmuştur. Asimtotik değerler sayısal incelenip dalga davranışı
grafiksel çizilmiştir.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2013. Supervisor: Assist. Prof. Dr. S. Habib Mazharimousavi.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2014-11-25T12:21:02Z2014-11-25T12:21:02Z2013-07ThesisRoozbeh, Ashkan. (2013). Wave propagation in a medium with position-dependent permittivity and permeability. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1521en
oai:i-rep.emu.edu.tr:11129/15472015-01-14T00:00:41Zhdl_11129_125Hawking Radiation of Non-asymptotically Flat Black HolesMirekhtiary, Seyedeh FatemehPhysicsQuantum GravityGravitationGeneral RelativitySpace - PhysicsHawking Radiation, Hamilton-Jacobi Equation, Quasinormal Modes, Linear Dilaton Black Hole, Grumiller Black Hole, Rindler Acceleration, Quantization, SpectroscopyABSTRACT: In this thesis, we study the Hawking radiation (HR) of non-asymptotically flat (NAF) four-dimensional (4 ) static and spherically symmetric (SSS) black holes (BHs) via the Hamilton-Jacobi (HJ) and the Parikh-Wilczek tunneling (PWT) methods. Specifically for this purpose, linear dilaton BH (LDBH) and Grumiller BH (GBH) or alias Grumiller-Mazharimousavi-Halilsoy BH (GMHBH) are taken into consideration. We should state that the GMHBH has the same metric structure with the GBH. The most important difference between them is the theories in which they are derived. While the GBH belongs to the Einstein’s theory, the GMHBH is the solution to the (ℜ) theory. For the GBH, we also study the quantization of its entropy/area via the quasinormal modes (QNMs).
We firstly apply the HJ method to the geometry of the LDBH. While doing this, in addition to its naive coordinates, we use four different regular (well behaved across the event horizon) coordinate systems which are isotropic, Painlevé-Gullstrand (PG), ingoing Eddington-Finkelstein (IEF) and Kruskal-Szekeres (KS) coordinates. Except the isotropic coordinates (ICs), direct computation of the HJ method leads us to obtain the standard Hawking temperature ( ) in all other coordinate systems. With the aid of the Fermat metric, the ICs allow us to read the index of refraction of the medium around the LDBH. It is explicitly shown that the refractive index determines the value of the tunneling rate and its natural consequence horizon temperature. But, the ICs produce an imperfect result for the horizon temperature of the LDBH. We also explain how this discrepancy can be resolved by regularizing the integral which has a pole at the event horizon. iv
Secondly, we study the HR of scalar particles from the GMHBH via the HJ method. The GMHBH is also known as Rindler modified Schwarzschild BH, which is suitable to be tested in astrophysics. By considering the GMHBH, we aim not only to explore the effect of the Rindler parameter ( ) on the , but to examine if there is any disparateness between the computed horizon temperature and the standard as well. For this purpose, we study on the three regular coordinate systems which are PG, IEF and KS coordinates. In all coordinate systems, we compute the tunneling probabilities of incoming and outgoing scalar particles from the event horizon by using the HJ equation. Thus, we show in detail that the HJ method is concluded with the conventional in all these coordinate systems without giving rise to the famed factor-2 problem. Furthermore, in the PG coordinates we employ the PWT method in order to show how one can integrate the quantum gravity (QG) corrections to the semiclassical tunneling rate by taking into account of the effects of self-gravitation and back reaction. Then we reveal the effects of the QG corrections on the .
Finally, we study the QNMs of the uncharged GBH. After reducing the radial equation of the massless Klein-Gordon (KG) equation to the Zerilli equation, we compute the complex frequencies of the QNMs of the GBH. To this end, an approximation method which considers small perturbations around the BH horizon is being used. Considering the highly damped QNMs in the process proposed by Maggiore, we obtain the quantum entropy/area spectra of the GBH. Although the QNM frequencies are governed by the term, we prove that the spectroscopy does not depend on that term. Here, the dimensionless constant of the area spectrum appears as the double of the Bekenstein's result. The reason of that discrepancy is also discussed. Keywords: Hawking radiation, Hamilton-Jacobi equation, quasinormal modes, linear dilaton black hole, Grumiller black hole, Rindler acceleration, quantization, spectroscopy.
…………………………………………………………………………………………………………………………
ÖZ: Bu tezde, Hamilton-Jacobi (HJ) ve Parikh-Wilczek tünelleme (PWT) metotlarını kullanmak suretiyle asimtotik-düz-olmayan (NAF) dört boyutlu (4D) statik ve küresel simetrik kara deliklerin (BHs) Hawking ışınımını (HR) çalışıyoruz. Özellikle bu amaç için, lineer dilatonlu BH (LDBH) ile Grumiller BH (GBH) veya diğer adıyla Grumiller-Mazharimousavi-Halilsoy BH (GMHBH) dikkate alınmaktadır. Bu arada hemen belirtmeliyiz ki GMHBH ile GBH aynı metrik yapısına sahiptirler. Aralarındaki en önemli fark elde edildikleri teoridir. GBH Einstein'ın teorisine ait iken, GMHBH (ℜ) teorisine ait bir çözümdür. Kuazinormal modlar (QNMs) yardımıyla GBH için ayrıca entropi/alan kuantizasyon çalışmasını yapmaktayız.
Biz ilk olarak LDBH geometrisine HJ yöntemini uyguluyoruz. Bunu yaparken, naif koordinatlara ek olarak, olay ufkunda tamamen düzenli olan dört farklı koordinat sistemini (izotropik, Painlevé-Gullstrand (PG), içeriye-giren Eddington-Finkelstein (IEF) ve Kruskal-Szekeres (KS)) kullanacağız. İzotropik koordinatlar (ICs) hariç, HJ yöntemi diğer tüm koordinat sistemlerinde bize standart Hawking sıcaklığını ( ) vermektedir. Fermat metriğinin yardımıyla ICs, LDBH etrafındaki ortamın kırılma indeksini okumamıza olanak sağlar. Kırılma indeksinin, tünelleme oranı ve onun bir sonucu olan ufuk sıcaklığının değerini belirlediği açıkca gösterilmiştir. Ancak, ICs LDBH’un ufuk sıcaklığı için uygun olmayan bir sonuç vermiştir. Ortaya çıkan bu tutarsız sonucun, ufukta bir kutba sahip integralin düzenlenmesi ile nasıl düzeltilebileceğini de göstermekteyiz.
İkinci olarak, HJ yöntemi ile GMHBH’den saçılan skalar parçacıkların HR çalışacağız. GMHBH, astrofizikte test edilmeye uygun olan Rindler modifiyeli Schwarzschild BH olarak da bilinir. GMHBH dikkate alarak, sadece Rindler parametresi ( )’nın üzerindeki etkisini keşfetmeyi değil, aynı zamanda hesaplanan ufuk sıcaklığı ile standart arasında farklılık var olup olmadığını da incelemeyi hedefliyoruz. Bu amaçla PG, IEF ve KS düzenli koordinat sistemlerinde çalışacağız. Bu koordinat sistemlerinde, HJ denklemi kullanarak olay ufkuna gelen ve giden skaler parçacıkların tünelleme olasılıklarını hesaplıyoruz. Böylelikle HJ yönteminin, ünlü faktör-2 sorununa neden olmaksızın, tüm bu koordinat sistemlerinde geleneksel ile sonuçlandığı ayrıntılı olarak göstermekteyiz. Dahası PG koordinatlarında, PWT yöntemi sayesinde kuantum yerçekimi (QG) düzeltmeli yarıklasik tünelleme oranının, öz-yerçekimi ve geri reaksiyon etkilerini dahil ederek nasıl elde edileceğini göstermekteyiz. Sonra QG düzeltmelerinin üzerindeki etkilerini ortaya koymaktayız.
Son olarak, yüksüz GBH'in QNMs’lerini çalışmaktayız. Kütlesiz Klein-Gordon (KG) denkleminden gelen radyal denklemi Zerilli denklemine indirgedikten sonra, GBH'a ait QNMs’ın kompleks frekanslarını hesaplamaktayız. Bu amaçla, BH ufku çevresinde, küçük perturbasyonları göz önünde bulunduran bir yaklaşım yöntemini kullanılmaktayız. Maggiore tarafından önerilen bir işlem sayesinde son derece sönümlü QNMs’ları dikkate alarak, GBHs’ların kuantum entropi/alan spektrumları elde etmekteyiz. QNM frekanslarının terimi tarafından yönetilmesine karşın, biz spektroskopinin bu terime bağlı olmadığını kanıtladık. Burada, alan spektrumunun boyutsuz sabiti , Bekenstein’nın sonucunun iki katı olarak ortaya çıkmaktadır. Bu tutarsızlığı nedeni ayrıca tartışılmaktadır. Anahtar kelimeler: Hawking radyasyonu, Hamilton-Jacobi denklemi, kuazinormal modlar, lineer dilatonlu kara delik, Grumiller kara deliği, Rindler ivmesi, kuantizasyon, spektroskopi.Doctor of Philosophy in Physics. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Assoc. Prof. Dr. İzzet Sakallı.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-01-13T09:46:16Z2015-01-13T09:46:16Z2014-05ThesisMirekhtiary, Seyedeh Fatemeh. (2014). Hawking Radiation of Non-asymptotically Flat Black Holes. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1547en
oai:i-rep.emu.edu.tr:11129/16202015-03-10T00:01:17Zhdl_11129_125Quantum Particle in a PT-symmetric WellAdamu, Suleiman BashirPhysicsQuantum theory - Nuclear physics - Quantum field theoryHamiltonian, PT - Symmetric Quantum Mechanics, Variational Principle, Eigenvalues and EigenfunctionsABSTRACT: In this thesis, we study the role of boundary conditions via -symmetric quantum mechanics. Where denotes parity operator and denotes time reversal operator. We present the boundary conditions so that the -symmetry remains unbroken. We give exact solvable solutions for a free particle in a box. In the first approach, we consider one dimensional Schrödinger Hamiltonian for a free particle in an infinite well. The energy equation is obtained and the results for the Eigenfunctions of the -symmetry are observed completely different form the usual textbooks ones. The second approach is the solution of the Klein Gordon equation in dimensions for the free particle in an infinite well. For both cases, the -symmetric eigenfunctions are normalized and plotted. The asymptotic behavior of the eigenfunction is provided. We consider a variational principle for -symmetric quantum system and examine an invertible linear operator ̂ for a weak-pseudo-hermicity generators for non-Hermitian Hamiltonian. 11
Keywords: Hamiltonian, -symmetric Quantum Mechanics, Variational Principle, Eigenvalues and Eigenfunctions.
…………………………………………………………………………………………………………………………
ÖZ: Bu tezde,sınır koşullarının rolü, -simetrik kuantum mekaniği aracılığıyla incelenmiştir. parite operatörü; ise zaman tersinmesi operatörünü ifade etmektedir. -simetri koşulunu yerine getiren sınır koşullarını sunduk. İlk bölümde, sonsuz kuyu içindeki serbest bir parçacık için bir boyutta Hamilyoniyeni ele alınıyo -simetri özfonksiyonlarını, alışılmış ders kitaplarında gördüğümüzden tamamen farklı bir biçimde elde ederken enerji denklemini bulduk. İkinci bölümde ise sonsuz kuyu içindeki serbest parçacık için 1+1 boyutta Klein Gordon denkleminin çözümüdür. Her iki durum için de, -simetri özfonksiyonları normalize edilmiş ve çizilmiştir. Özfonksiyonun asimptotik davranışı sağlanmıştır. Son bölümde, -simetrik kuantum systemi için varyasyon prensibi dikkate alınmış ve non-hermityen Hamiltoniyen kullanarak, zayıf psödo hermityenlik üreteçleri için tersinir bir lineer operatör incelenmiştir.
Anahtar Kelimeler: Hamiltoniyen, -simetrik Kuantum Mekaniği, Varyasyon prensibi, Özdeğerler ve Özfonksiyonlar.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor:Assoc. Prof. Dr. Habib Mazharimousavi.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-03-09T09:28:31Z2015-03-09T09:28:31Z2014-06ThesisAdamu, Suleiman Bashir. (2014). Quantum Particle in a PT-symmetric Well. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1620en
oai:i-rep.emu.edu.tr:11129/16502015-03-18T00:01:04Zhdl_11129_125Hawking Radiation of Rindler Modified Schwarzschild Black HoleYakub, Sherwan Kher Al-DenPhysicsQuantum theoryQuantum gravitySpace PhysicsQuantum Tuneling Method, Hawking Radiation, Relativistic Hamilton-Jacobi Equation, Parikh-Wilczek Method, Damour-Ruffini-Sannan Method, Grumiller Black Hole, Rindler AccelerationABSTRACT: One of the significant techniques to calculate the black hole (BH) temperature and understand BH thermodynamics is to employ the semi-classical BH tunneling method. In this thesis, by using the Parikh-Wilczek (PW), Hamilton-Jacobi (HJ) and Damour-Ruffini-Sannan (DRS) tunneling methods, we aim to explore the Hawking radiation (HR) of the Grumiller BH (GBH). This BH is also known as Rindler modified Schwarzschild BH. Generally, in the tunneling method the imaginary part of the action (classically forbidden process) is directly proportional to the Boltzmann factor or is inversely proportional to the temperature of the BH whose performing the Hawking radiation (HR). In the original work of PW, who considered the self-gravitational effect with the energy conservation, it was shown that the small deviations from pure thermal radiation in the HR may cause to a leakage of the information from the BH. This phenomenon is summarized and extended to the GBH in this dissertation.
Keywords: Quantum tunneling method, Hawking radiation, Relativistic Hamilton-Jacobi equation, Parikh-Wilczek method, Damour-Ruffini-Sannan method, Grumiller black hole, Rindler acceleration.
…………………………………………………………………………………………………………………………
ÖZ: Kara delik (BH) sıcaklığını hesaplamak ve BH termodinamiğini anlamak için en önemli tekniklerden birisi yarı-klasik BH tünelleme yöntemini kullanmaktır. Bu tezde, Parikh-Wilczek (PW), Hamilton-Jacobi (HJ) ve Damour-Ruffini-Sannan (DRS) tünelleme yöntemleri kullanarak, biz Grumiller BH (GBH)'un ve Hawking radyasyonunu (HR) araştırmayı hedefliyoruz. Bu BH, Rindler modifiyeli Schwarzschild BH'u olarak da bilinmektedir. Genel olarak, tünelleme yönteminde eylemin (klasik olarak yasaklanmış işlem) sanal kısmı Boltzmann faktörü ile doğrudan orantılıdır ya da Hawking radyasyon (HR) gerçekleştiren BH'un sıcaklığına ters orantılıdır. Enerji korunumu ile kendini yerçekimi etkisinin dikkate alındığı PW'in orjinal çalışmasında, HR'nın saf termal radyasyonundaki küçük sapmaların BH'dan bir bilgi sızıntısına neden olduğu gösterilmiştir. Bu olgu, bu tezde özetlenmiş ve GBH için genişletilmiştir.
Anahtar kelimeler: Kuantum tünelleme metodu, Hawking radyasyonu, Relativisitik Hamilton-Jacobi denklemi, Parikh-Wilczek metodu, Damour-Ruffini-Sannan metodu, Grumiller kara deliği, Rindler ivmesi.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Assoc. Prof. Dr. İzzet Sakallı.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-03-17T08:24:11Z2015-03-17T08:24:11Z2014-07ThesisYakub, Sherwan Kher Al-Den. (2014). Hawking Radiation of Rindler Modified Schwarzschild Black Hole. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1650en
oai:i-rep.emu.edu.tr:11129/16752015-03-25T00:01:13Zhdl_11129_125Wave Propagation in an Inhomogeneous MatterAlhmod, Zainab Sauod MuhmmedPhysicsWavesElectromagnetics, Permittivity, Permeability, Inhomogeneous Matter, Wave PropagationABSTRACT: We study the waves spread in the media, non-linear and non-homogeneous is basic and widespread Problem in physics, which is the subject of our research. We derive the equation of Maxwell for the wave equation based on the z axis and y and find General solutions to the wave equation. We used some of the methods and mathematical processes for the wave equation to be as (hyper-geometric differential equation), and then to be easy to find general solutions to the two parts, the first as a coefficient of permittivity function of y, and the second as a constant. Keywords: Electromagnetics, Permittivity, Permeability.
…………………………………………………………………………………………………………………………
ӦZ: Doğrusal ve düzgün (homojen ) olmayan bir ortamda dalgaların yayılma problemi bu tezin özünü oluşturmaktadır. Burada z ve y koordinatlarına bağımlı genel Maxwell denklemleri çözülmüştür. Matematiksel olarak hiper-geometrik difransiyel denklemi elde edilmiş olup onun elektrik geçirgenlik (permitivite) katsayının y – bağımlı ve sabit durumları için çözümler bulunmuştur.
Anahtar kelimeler: Elektromagnetizma, Elektrik ve Magnetik geçirgenlik katsayıları.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Assoc. Prof. Dr. Habib Mazharimousavi.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-03-24T13:05:38Z2015-03-24T13:05:38Z2014-08ThesisAlhmod, Zainab Sauod Muhmmed. (2014). Wave Propagation in an Inhomogeneous Matter. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1675en
oai:i-rep.emu.edu.tr:11129/17042015-04-13T23:01:10Zhdl_11129_125Schrödinger Equation with Noninteger DimensionsHssain, Ala HamdPhysicsQuantum TheoryNoninteger Dimensions, Schrodinger Equation, Gegenbauer Polynomial Functions, Bessel FunctionsABSTRACT: Exact solutions in quantum theory play crucial roles in the application areas of the theory. For instance knowing the exact eigenvalues and eigen-functions of the Hamiltonian of the Hydrogen atom helps the Chemists to find, with a high accuracy, the energy levels of more complicated atoms like Helium and Calcium. Therefore any attempt to find an exact solvable system in quantum mechanics is remarkable. For this reason in this thesis we aim to find exactly solvable systems in quantum theory but not in integer dimensions. We consider noninteger dimensional quantum systems. The corresponding Schrödinger equation is introduced. With specific potential, an infinite well, we solve the Schrödinger equation both its angular part and radial part. The angular part admits a solution in terms of Gegenbauer polynomial functions and the radial part gives a solution in terms of the Bessel functions.
Keywords: Noninteger dimensions; Schrödinger equation; Gegenbauer polynomial functions; Bessel functions.
…………………………………………………………………………………………………………………………
ÖZ: Kuantum Kuram tatbikatında kesin çözümler önemli rol oynamaktadır. Örneğin H-atom Hamilton fonksiyonunun düzgün değer ve fonksiyonlarının bilinmesi kimyacılara Helyum ve Kalsiyum gibi atomların yüksek enerji seviyelerini doğru olarak vermektedir. Bu nedenle kesin çözülebilir yöntemler hep önem arzetmiştir. Bu tezde tam sayılı olmayan boyutlarda kesin çözüm hedeflenmiştir. Kesirli boyutlu kuantum sistemleri ele alınmış olup Schrödinger denklemi yazılmıştır. Özel potansiyel için sonsuz bir kuyu için Schrödinger denkleminin radyal ve açısal kısımlar incelenmiştir. Açısal kısım Gegenbauer, radyal kısım ise Bessel fonksiyonları cinsinden elde edilmiştir.
Anahtar kelimeler: Kesirli boyutlar; Schrödinger denklemi; Gegenbauer polinomları; Bessel fonksiyonları.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Assoc. Prof. Dr. Habib Mazharimousavi.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-04-13T12:41:48Z2015-04-13T12:41:48Z2014-09ThesisHssain, Ala Hamd. (2014). Schrödinger Equation with Noninteger Dimensions. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1704en
oai:i-rep.emu.edu.tr:11129/17372015-06-24T23:00:46Zhdl_11129_125Radial Power-Law Position-dependent Mass, Cylindrical Coordinates, Spectral SignaturesSaty, Majeed J. SaleemPhysicsPower-law potential, Position dependent-masses, cylindrically symmetric settings, exactly solvable modelsABSTRACT: By exploring the Position-dependent mass Von Roos Hamiltonian under cylindrical coordinates settings, we discuss the separation of variables of Schrödinger equation. Two radial masses of a coulomb-type and a harmonic oscillator-type are considered, and the effects of various z-dependent interaction potentials on the spectra are studied.
Keywords: Power-law potential, Position dependent-masses, cylindrically symmetric settings, exactly solvable models.
…………………………………………………………………………………………………………………………
ÖZ: Silindirik simetrik problemlerde Von Roos Hamilton fonksiyonu sayesinde pozisyona bağımlı kütleli Schrödinger denkleminin değişken ayrılırlığı tartışılmıştır. Kulomb ve harmonik titreşen sistemlerde radyal uzaklığa bağımlı kütle ele alınmış olup bazı -bağımlı etkileşim potansiyellerinin spektrumlar üzerindeki etkisi incelenmiştir.
Anahtar Kelimeler : Üstel bağımlı potansiyel, pozisyona bağımlı kütle, silindirik simetri, kesin çözünürlü modeller.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2015. Supervisor: Prof. Dr. Omar Mustafa.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-06-24T11:47:07Z2015-06-24T11:47:07Z2015-01ThesisSaty, Majeed J. Saleem. Radial Power-Law Position-dependent Mass, Cylindrical Coordinates, Spectral Signatures. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1737en
oai:i-rep.emu.edu.tr:11129/17622015-06-29T23:00:49Zhdl_11129_125Spectroscopy of Black HolesTokgöz, GülnihalPhysicsSpace - PhysicsGarfinkle-Horowitz-Strominger Black Hole, Z = 0 Lifshitz Black Hole, Maggiore's Method, Black Hole Spectroscopy, Quasilocal MassABSTRACT: In this thesis, the Maggiore's method (MM), which evaluates the transition frequency that appears in the adiabatic invariant from the highly damped quasinormal mode (QNM) frequencies, is used to investigate the entropy/area spectra of the Garfinkle-Horowitz-Strominger black hole (GHSBH) and z = 0 Lifshitz black hole (ZZLBH). The complex QNM frequencies of the GHSBH and ZZLBH are computed using the confluent hypergeometric (CH) differential equation that arises when the scalar perturbations around the event horizon are considered. Although the entropy/area is characterized by the parameters of black holes (BHs), their quantization is shown to be independent of those parameters. However, both spectra are equally spaced. We also represent the mass calculations of the associated BHs. In this regard, we compute the mass of the GHSBH by using Komar’s mass integral formulation. For the mass of the ZZLBH, we use both Wald’s entropy formula and Brown-York (BY)'s quasilocal mass formalism. Keywords: Garfinkle-Horowitz-Strominger Black Hole, z = 0 Lifshitz Black Hole, Maggiore's Method, Black Hole Spectroscopy, Quasilocal Mass.
…………………………………………………………………………………………………………………………
ÖZ: Bu tezde, Garfinkle-Horowitz-Strominger (GHSBH) kara deliğinin ve z = 0 Lifshitz kara deliğinin (ZZLBH) entropi/alan spektrumlarını incelemek için, adyabatik invaryant içerisinde görülen geçiş frekansını, yüksek sönümlenen kuazinormal mod (QNM) frekanslarından elde eden Maggiore’un metodu (MM) kullanılmıştır. Olay ufkunun etrafında skalar pertürbasyonlar düşünüldüğü zaman ortaya çıkan konflüent hipergeometrik (CH) diferansiyel denklemi kullanılarak, GHSBH ve ZZLBH’a ait kompleks kuazinormal mod frekansları hesaplanmıştır. Entropi/alan, kara delik (BH) parametreleri ile karakterize edilmesine rağmen, kuantizasyonun bu parametrelerden bağımsız olduğu gösterilmiştir. Bununla birlikte, her iki spektrumun da eşit aralıklı olduğu gösterilmiştir. İlgili BH'ların kütle hesapları da ayrıca gösterilmiştir. Bu bağlamda, GHSBH kütlesi Komar’ın kütle integrali kullanılarak hesaplanmıştır. ZZLBH kütlesi için ise hem Wald entropi formülü hem de Brown-York (BY)'un kuazilokal kütle formalizmi kullanılmıştır.
Anahtar Kelimeler: Garfinkle-Horowitz-Strominger Kara Deliği, Lifshitz Kara Deliği, z = 0 Maggiore Metodu, Kara Delik Spektroskopisi, Kuazilokal Kütle.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2015. Supervisor: Assoc. Prof. Dr. İzzet Sakallı.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-06-29T12:26:43Z2015-06-29T12:26:43Z2015-02ThesisTokgoz, Gulnihal. (2015). Spectroscopy of Black Holes. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1762en
oai:i-rep.emu.edu.tr:11129/17922015-07-01T23:00:44Zhdl_11129_125d-dimensional Position Dependent Mass, Quasi-Free Quantum ParticleTaha, Khozer AbdalrahimPhysicsQuantum Mechanicsd-dimensional, position dependent mass (PDM), constant mass (CM), point canonical transformation (PCT), quasi-free particle, harmonic oscillator, Pöschl-Teller potentialABSTRACT: This thesis deals with the applications of PDM in one and d-dimensions. In the one-dimensional case the classical as well as the quantum mechanical approach are discussed, and the position dependent mass formalism in one dimension is applied to harmonic oscillator and the quasi free particle case, i.e. where ( ⃗) . Furthermore, the extension to d-dimensions is given and applied to the d-dimensional Harmonic Oscillator and the d-dimensional Coulomb Potential.
Keywords: d-dimensional, position dependent mass (PDM), constant mass (CM), point canonical transformation (PCT), quasi-free particle, harmonic oscillator, Pöschl-Teller potential.
…………………………………………………………………………………………………………………………
ÖZ: Bu tez konuma bağlı kütlenin d-boyuttaki uygulamalarını ele alıyor. Bir boyutta klasik ve kuantum mekaniksel teori tartışıldı ve konuma bağlı kütle formalizm bir boyutlu harmonik osilatör ve bağımsız gibi parçacık için farklı konuma bağlı kütle fonksyonları için uygulanmıştır. Ayrıca konuma bağlı kütle modeli d-boyuta genişletilmiş ve d-boyutlu harmonik osilatör ve Coulomb potansiyellerine uygulanmıştır.
Anahtar sözcükler: konuma bağlı kütle, d-boyutlu konuma bağlı kütle, sabit kütle, nokta kuralsal dönüşüm, bağımsız gibi parçacık, harmonik osilatör, Pöschl-Teller Potansiyeli.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2015. Supervisor: Assist. Prof. Dr. Mustafa Rıza.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-07-01T08:05:09Z2015-07-01T08:05:09Z2015-01ThesisTaha, Khozer Abdalrahim. (2015). d-dimensional Position Dependent Mass, Quasi-Free Quantum Particle. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1792en
oai:i-rep.emu.edu.tr:11129/17932015-07-01T23:00:45Zhdl_11129_125Geodesics on Cosmic Landscapes of Colliding Plane WavesSharon, Jo-Kim Dauda TokPhysicsGravity wavesCosmic Landscape, gravitational waves, geodesics, horizons/singularitiesABSTRACT: On a Cosmic Landscape, the metric structure vested with two orthogonal space-like Killing vectors; a class of solutions of the Einstein-Maxwell’s field equations, is spotlighted from the global structural viewpoints of the Khan-Penrose and Bell-Szekeres space-time continua or Cosmic Landscapes: a platform for discussing the motion of a test particle. A solution, spring-boarded by the Ferrari-Ibanez hybrid formalism, also provides a launch-pad for discussing the motion of a test particle on a Degenerate Cosmic Landscape. When a particle is placed along the path of two colliding plane waves, it will be forced to follow a geodesic, defined by the properties of the global structure, leading to either a singularity or a horizon. In the null- coordinates,( , ), the interaction region is bounded, so given the initial conditions the later developments are plotted numerically. The time of fall into the singularity or horizon is also obtained. Keywords: Cosmic Landscape, gravitational waves, geodesics, horizons/singularities.
…………………………………………………………………………………………………………………………
ÖZ: Kozmik uzayda birbirine dik iki uzaysal Killing vektörle belirlenen Khan-Penrose ve Bell-Szekeres (Einstein-Maxwell teorisi) uzayları içerisinde test-partikül hareketleri incelenmiştir. Bu yönde karışık (hibrit) bir çözüm uzayı olan Ferrari-Ibanez çözümü örnek alınmıştır. Bir dalga çarpışma uzayında jeodeziler üzerinde hareket eden partiküller tekillik veya ufuk yüzeyine ulaşmaktadır. Işıksal ( , ) koordinat uzayında ilk şartlara bağımlı hareketlerin zaman gelişimi sayısal yöntemlerle çizilmiştir. Aynı yöntemle tekillik/ufuk düzlemine varış zamanı elde edilmiştir.
Anahtar Kelimeler: Kozmik uzay, yerçekim dalgaları, jeodeziler, uzay düzlem ve tekillikleri.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2015. Supervisor: Prof. Dr. Mustafa Halilsoy.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-07-01T08:11:37Z2015-07-01T08:11:37Z2015-02ThesisSharon, Jo-Kim Dauda Tok. (2015). Geodesics on Cosmic Landscapes of Colliding Plane Waves. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1793en
oai:i-rep.emu.edu.tr:11129/18122015-07-03T23:00:43Zhdl_11129_125Thermomechanical properties of graphene and the graphene's impact on motion of light atoms by means of molecular dynamicsLajevardipour, AlirezaPhysicsGraphene Sheet Stochastic Motion Noble Gases Langevin Dynamics Valence Force Field Thermomechanical Properties Suspended Graphene Tensile and Compressive StrainDoctor of Philosophy in Physics. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2012. Supervisor: Prof. Dr. Mustafa Halilsoy.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-07-03T04:47:12Z2015-07-03T04:47:12Z2012-06ThesisLajevardipour, Alireza. (2012). Thermomechanical properties of graphene and the graphene's impact on motion of light atoms by means of molecular dynamics. Thesis (Ph.D.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1812en
oai:i-rep.emu.edu.tr:11129/18752015-11-21T00:00:23Zhdl_11129_125The Effect of Probe Pressure on In Vivo Single Fiber Reflectance SpectroscopyShakibaei, Ali AkbarPhysicsreflectance spectroscopy - single fiber reflectance spectroscopyABSTRACT: Reflectance spectroscopy is a method to noninvasively quantitate the scattering and absorption properties of a turbid medium like tissue. The absorption and scattering properties can be used in diagnosis of different diseases such as cancer. Dependence of the acquired spectra to the environmental and physiological factors like probe pressure and habits of the person are being sought out in this thesis. Our applied method, single fiber reflectance (SFR) spectroscopy, uses a single fiber for delivery and detection of the visible light. The SFR spectrum can be fitted by a nonlinear model of the scattering and absorption properties of the tissue under investigation. In this study, SFR measurements are made by a fiber-optic probe gently placed on the lip tissue of some volunteers. The effect of variation in the probe pressure during the measurements is evaluated through the probable change in the extracted parameters from the fitted spectra. In order to do this, first the most appropriate model for the human lip reflectance spectrum is found. Then, the variation in the extracted parameters due to different probe pressures or physiologic characteristics of the volunteers is investigated. Keywords: reflectance spectroscopy - single fiber reflectance spectroscopy.
…………………………………………………………………………………………………………………………
ÖZ: Yansıtma Spektroskopisi, doku gibi bulanık bir ortamın saçılma ve soğurma özelliklerini non invaziv bir şekilde niceleştiren bir yöntemdir. Soğurma ve saçılma özellikleri, kanser gibi çeşitli hastalıkların teşhisinde kullanılabilir. Bu tezde, elde edilen spektrumun prob baskısı ve kişinin alışkanlıkları gibi çevresel ve fizyolojik faktörlere bağlı olup olmadığı aranmaktadır.
Uyguladığımız yöntem olan Tek Fiber Yansıma (SFR ) Spektroskopisi, görünür ışık iletimi ve saptanması için tek bir fiber kullanmaktadır. SFR spektrumu, araştırmakta olduğumuz dokunun saçılma ve soğurma özelliklerinin doğrusal olmayan bir modeli ile incelenebilir.
Bu çalışmadaki SFR ölçümler, bazı gönüllülerin dudak dokularının üzerine yavaşça yerleştirilen bir fiber -optik prob ile yapılmıştır. Ölçümler boyunca gerçekleşen prob basıncındaki değişimlerin etkisi, grafiklerden elde edilen parametrelerin olası değişimleri dikkate alınarak değerlendirilmiştir. Bunu yapabilmek için öncelikle insan dudak yansıtma spektrumuna en uygun model bulunur. Son olarak, parameterler üzerinde, farklı prob baskılarına bağlı olarak veya gönüllülerin fizyolojik özellikleri nedeniyle ortaya çıkan variyasyonlar incelenmiştir.
AnahtarKelimeler: yansıma spektroskopisi, tek fiber yansıma spektroskopisi.Master of Science in Physics. Thesis (M.S.)--Eastern Mediterranean University, Faculty of Arts and Sciences, Dept. of Physics, 2014. Supervisor: Prof. Dr. Özay Gürtuğ.Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ)2015-11-20T06:29:55Z2015-11-20T06:29:55Z2014-01ThesisShakibaei, Ali Akbar. (2014). The Effect of Probe Pressure on In Vivo Single Fiber Reflectance Spectroscopy. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Physics, Famagusta: North Cyprus.http://hdl.handle.net/11129/1875en
oai:i-rep.emu.edu.tr:11129/18932016-01-11T12:28:57Zhdl_11129_481Particle Collision near 1+1-DH-LBHsÖvgün, AliHalilsoy, Mustafageneral relativityparticle collisionparticle collisionBSW effectgravityphysicsThis poster is presented in KSM2015, Frankfurt, Germany2016-01-04T08:34:25Z2016-01-04T08:34:25Z2016-01-04Otherhttp://hdl.handle.net/11129/1893en
oai:i-rep.emu.edu.tr:11129/18942016-01-11T12:30:04Zhdl_11129_787Tunnelling of vector particles from Lorentzian wormholes in 3+1 dimensionsSakallı, İzzetÖvgün, Aligravitygeneral relativitywormholesquantum tunnelingparticle physicsphysicsIn this article, we consider the Hawking radiation (HR) of vector (massive spin-1) particles
from the traversable Lorentzian wormholes (TLWH) in 3+1 dimensions. We start by providing the Proca
equations for the TLWH. Using the Hamilton-Jacobi (HJ) ansatz with the WKB approximation in the
quantum tunneling method, we obtain the probabilities of the emission/absorption modes. Then, we derive
the tunneling rate of the emitted vector particles and manage to read the standard Hawking temperature
of the TLWH. The result obtained represents a negative temperature, which is also discussed.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1140/epjp/i2015-15110-9) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.THE EUROPEAN PHYSICAL JOURNAL PLUS, Springer2016-01-04T09:06:50Z2016-01-04T09:06:50Z2015-06-11Article"Tunneling of Vector Particles From Lorentzian Wormholes in 3+1 Dimensions", Izzet Sakalli and Ali Ovgun, Eur. Phys. J. Plus 130, 110 (2015).2190-5444http://dx.doi.org/10.1140/epjp/i2015-15110-9http://hdl.handle.net/11129/1894en;Eur. Phys. J. Plus (2015) 130: 110
oai:i-rep.emu.edu.tr:11129/18952016-01-06T07:06:39Zhdl_11129_787Uninformed Hawking radiationSakallı, İzzetÖvgün, Alihawking radiationblack holesphysicsgravitygeneral relativityWe show in detail that the Parikh-Wilczek tunneling method (PWTM), which was
designed for resolving the information loss problem in Hawking radiation (HR) fails whenever the
radiation occurs from an isothermal process. The PWTM aims to produce a non-thermal HR
which adumbrates the resolution of the problem of unitarity in quantum mechanics (QM), and
consequently the entropy (or information) conservation problem. The effectiveness of the method
has been satisfactorily tested on numerous black holes (BHs). However, it has been shown that the
isothermal HR, which results from the emission of the uncharged particles of the linear dilaton BH
(LDBH) described in the Einstein-Maxwell-Dilaton (EMD) theory, the PWTM has vulnerability in
having non-thermal radiation. In particular, we consider Painlev´e-Gullstrand coordinates (PGCs)
and isotropic coordinates (ICs) in order to prove the aforementioned failure in the PWTM. While
carrying out calculations in the ICs, we also highlight the effect of the refractive index on the null
geodesics.The file in this item is the publisher version (published version) of the article.EPL, IOP Publishing (Institute of Physics)2016-01-04T09:30:24Z2016-01-04T09:30:24Z2015-04-24Article"Uninformed Hawking Radiation", I. Sakalli and A. Ovgun, Europhys. Lett. 110, 10008 (2015).1286-4854DOI: 10.1209/0295-5075/110/10008http://hdl.handle.net/11129/1895en_US;EPL, 110 (2015) 10008
oai:i-rep.emu.edu.tr:11129/18972016-01-07T07:20:27Zhdl_11129_787Quantum tunneling of massive spin-1 particles from non-stationary metricsSakallı, İzzetÖvgün, Aliquantum tunnelingblack holeshawking radiationgeneral relativityRegular coordinatesProca equationMassive vector particlesWe focus on the HR of massive vector (spin-1) particles tunneling from
Schwarzschild BH expressed in the Kruskal–Szekeres and dynamic Lemaitre coordinates.
Using the Proca equation together with the Hamilton–Jacobi and the WKB
methods, we show that the tunneling rate, and its consequence Hawking temperature
are well recovered by the quantum tunneling of the massive vector particles.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10714-015-1997-y) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.General Relativity and Gravitation, Springer2016-01-04T11:01:11Z2016-01-04T11:01:11Z2015-11-15Article"Quantum tunneling of massive spin-1 particles from non-stationary metrics " I. Sakalli and A. Ovgun, Accepted Paper, Gen. Relat. Gravit. (arXiv: 1507.01753) (2015).1572-9532 (Online)0001-7701 (Print)http://dx.doi.org/10.1007/s10714-015-1997-yhttp://hdl.handle.net/11129/1897en_US;Gen Relativ Gravit (2016) 48:1
oai:i-rep.emu.edu.tr:11129/18982016-01-11T13:24:46Zhdl_11129_787Thin-shell wormholes from the regular Hayward black holeHalilsoy, MustafaÖvgün, AliMazharimousavi, S. Habibwormholesthin-shellgeneral relativityblack holesHayward black holeElementary Particles, Quantum Field TheoryNuclear Physics, Heavy Ions, HadronsQuantum Field Theories, String TheoryMeasurement Science and InstrumentationAstronomy, Astrophysics and CosmologyNuclear EnergyWe revisit the regular black hole found by Hayward in 4 -dimensional static, spherically symmetric spacetime. To find a possible source for such a spacetime we resort to the nonlinear electrodynamics in general relativity. It is found that a magnetic field within this context gives rise to the regular Hayward black hole. By employing such a regular black hole we construct a thin-shell wormhole for the case of various equations of state on the shell. We abbreviate a general equation of state by p=ψ(σ) where p is the surface pressure which is a function of the mass density (σ) . In particular, linear, logarithmic, Chaplygin, etc. forms of equations of state are considered. In each case we study the stability of the thin shell against linear perturbations. We plot the stability regions by tuning the parameters of the theory. It is observed that the role of the Hayward parameter is to make the TSW more stable. Perturbations of the throat with small velocity condition are also studied. The matter of our TSWs, however, remains exotic.The file in this item is the publisher version (published version) of the article.The European Physical Journal C, Springer2016-01-04T11:28:25Z2016-01-04T11:28:25Z2014-03-13ArticleMustafa Halilsoy, Ali Ovgun and S. HabibMazharimousavi, arXiv:1312.6665 "Thin-shell wormholes from the regular Hayward black hole". Eur. Phys. J. C (2014) 74:2796.1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-014-2796-4http://hdl.handle.net/11129/1898en_US;Eur. Phys. J. C (2014) 74:2796
oai:i-rep.emu.edu.tr:11129/18992016-01-11T12:30:40Zhdl_11129_787Hawking Radiation of Spin-1 Particles from a Three-Dimensional Rotating Hairy Black HoleSakallı, İzzetÖvgün, AliParticle and Nuclear PhysicsClassical and Quantum Gravitation, Relativity TheoryElementary Particles, Quantum Field Theory,Solid State PhysicsHawking Radiation, Rotating Hairy Black Hole, Black Holes, General RelativityWe study the Hawking radiation of spin-1 particles (so-called vector particles) from a three-dimensional
rotating black hole with scalar hair using a Hamilton–Jacobi ansatz. Using the Proca equation in the
WKB approximation, we obtain the tunneling spectrum of vector particles. We recover the standard Hawking
temperature corresponding to the emission of these particles from a rotating black hole with scalar hairThe file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1134/S1063776115090113) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Journal of Experimental and Theoretical Physics2016-01-04T11:48:14Z2016-01-04T11:48:14Z2015-09-27Article"Hawking Radiation of Spin-1 Particles From Three Dimensional Rotating Hairy Black Hole", Izzet Sakalli and Ali Ovgun, J. Exp. Theor. Phys. Vol. 121, No.3 (2015).1090-6509 (online)1063-7761 (print)http://dx.doi.org/10.1134/S1063776115090113http://hdl.handle.net/11129/1899en_US;Vol. 121, No. 3, pp. 404–407.
oai:i-rep.emu.edu.tr:11129/19002016-01-11T13:22:14Zhdl_11129_787Gravitinos tunneling from traversable Lorentzian wormholesSakalli, İzzetÖvgün, AligravitinosLorentzian wormholeshawking radiationquantum tunnelinggeneral relativityphysicsSpin-3/2 particlesRecent research shows that Hawking radiation (HR) is also possible around the trapping horizon of a wormhole. In this article, we show that the HR of gravitino (spin-3/2 ) particles from the traversable Lorentzian wormholes (TLWH) reveals a negative Hawking temperature (HT). We first introduce the TLWH in the past outer trapping horizon geometry (POTHG). Next, we derive the Rarita-Schwinger equations (RSEs) for that geometry. Then, using both the Hamilton-Jacobi (HJ) ansätz and the WKB approximation in the quantum tunneling method, we obtain the probabilities of the emission/absorption modes. Finally, we derive the tunneling rate of the emitted gravitino particles, and succeed to read the HT of the TLWH.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10509-015-2482-5) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Astrophysics and Space Science, Springer2016-01-04T12:12:57Z2016-01-04T12:12:57Z2015-08-19Article"Gravitinos Tunneling From Traversable Lorentzian Wormholes" Izzet Sakalli and Ali Ovgun, Astrophys.1572-946X (online)0004-640X (print)http://dx.doi.org/10.1007/s10509-015-2482-5http://hdl.handle.net/11129/1900en_USDOI 10.1007/s10509-015-2482-5;Astrophys Space Sci (2015) 359:32
oai:i-rep.emu.edu.tr:11129/19042016-01-06T06:46:35Zhdl_11129_787Hypocycloidal throat for 2+1-dimensional thin-shell wormholesMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesphysicsgravityElementary Particles, Quantum Field TheoryNuclear Physics, Heavy Ions, HadronsQuantum Field Theories, String TheoryMeasurement Science and InstrumentationAstronomy, Astrophysics and CosmologyNuclear EnergyRecently we have shown that for 2+1−dimensional thin-shell wormholes a non-circular throat may lead to a physical wormhole in the sense that the energy conditions are satisfied. By the same token, herein we consider angular dependent throat geometry embedded in a 2+1−dimensional flat spacetime in polar coordinates. It is shown that a generic, natural example of throat geometry is provided remarkably by a hypocycloid. That is, two flat 2+1−dimensions are glued together along a hypocycloid. The energy required in each hypocycloid increases with the frequency of the roller circle inside the large oneThe file in this item is the publisher version (published version) of the article.The European Physical Journal C, Springer2016-01-05T07:20:42Z2016-01-05T07:20:42Z2015-11-19ArticleS. Habib Mazharimousavi, M. Halilsoy, "Hypocycloidal throat for 2+1-dimensional thin-shell wormholes" Eur. Phys. J. C (2015) in press.1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-015-3770-5http://hdl.handle.net/11129/1904en_USTHE EUROPEAN PHYSICAL JOURNAL PLUS, Springer;Eur.Phys.J. C75 (2015) 11, 540
oai:i-rep.emu.edu.tr:11129/19052016-01-06T06:47:02Zhdl_11129_7872+1-dimensional wormhole from a doublet of scalar fieldsMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesWe present a class of exact solutions in the framework of (2+1)-dimensional Einstein gravity coupled minimally to a doublet of scalar fields. Our solution can be interpreted upon the tuning of parameters as an asymptotically flat wormhole as well as a particle model in 2+1 dimensions.The file in this item is the publisher version (published version) of the article.Physical Review D, American Physical Society2016-01-05T07:32:30Z2016-01-05T07:32:30Z2015Article“2+1 – Dimensional magnetically charged solutions in Einstein – Power – Maxwell theory”. S. Habib Mazharimousavi, O. Gurtug, M. Halilsoy and O. Unver, Phys. Rev. D 84, 124021 (2011).1550-7998DOI: 10.1103/PhysRevD.92.024040http://hdl.handle.net/11129/1905en_US;Phys.Rev. D92 (2015) 024040
oai:i-rep.emu.edu.tr:11129/19062016-01-06T06:58:03Zhdl_11129_7873+1 -dimensional thin shell wormhole with deformed throat can be supported by normal matterMazharimousavi, S. HabibHalilsoy, Mustafageneral relativitywormholeFrom the physics standpoint the exotic matter problem is a major difficulty in thin shell wormholes (TSWs) with spherical/cylindrical throat topologies. We aim to circumvent this handicap by considering angle dependent throats in 3+1 dimensions. By considering the throat of the TSW to be deformed spherical, i.e., a function of θ and φ, we present general conditions which are to be satisfied by the shape of the throat in order to have the wormhole supported by matter with positive density in the static reference frame. We provide particular solutions/examples to the constraint conditions.The file in this item is the publisher version (published version) of the article.The European Physical Journal C, Springer2016-01-05T07:58:16Z2016-01-05T07:58:16Z2015ArticleS. HabibMazharimousavi, M. Halilsoy, "3+1-dimensional thin-shell wormhole with deformed throat can be supported by normal matter" Eur. Phys. J. C 75, 271 (2015).1434-6052 (online)1434-6044 (print)http://hdl.handle.net/11129/1906en_USSpringer;Eur.Phys.J. C75 (2015) 6, 271
oai:i-rep.emu.edu.tr:11129/19072016-01-11T13:23:42Zhdl_11129_787Quantum Probes of Timelike Naked Singularities in -Dimensional Power-Law SpacetimesGürtuğ, ÖzayMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesThe formation of naked singularities in 2+1-dimensional power-law spacetimes in linear Einstein-Maxwell and Einstein-scalar theories sourced by azimuthally symmetric electric field and a self-interacting real scalar field, respectively, are considered in view of quantum mechanics. Quantum test fields obeying the Klein-Gordon and Dirac equations are used to probe the classical timelike naked singularities developed at . We show that when the classically singular spacetimes probed with scalar waves, the considered spacetimes remain singular. However, the spinorial wave probe of the singularity in the metric of a self-interacting real scalar field remains quantum regular. The notable outcome in this study is that the quantum regularity/singularity cannot be associated with the energy conditions.The file in this item is the publisher version (published version) of the article.Advances in High Energy Physics, Hindawi Publishing Corporation2016-01-05T08:14:51Z2016-01-05T08:14:51Z2015ArticleOzay Gurtug, Mustafa Halilsoy, S. HabibMazharimousavi, arXiv:1312.4453 "Quantum probes of timelike naked singularities in the weak field regime of f(R) global monopole spacetime". Advances in High Energy Physics, (2015) 178.1687-7357DOI: 10.1155/2015/684731http://hdl.handle.net/11129/1907en_US;Adv.High Energy Phys. 2015 (2015) 684731
oai:i-rep.emu.edu.tr:11129/19082016-01-06T07:12:33Zhdl_11129_787Screening of the Reissner–Nordström charge by a thin-shell of dust matterMazharimousavi, S. HabibHalilsoy, Mustafageneral relativitywormholeA concentric charged thin-shell encircling a Reissner-Nordstr\"{o}m black hole screens the clectric / magnetic charge completely to match with an external Schwarzschild black hole. The negative mass thin-shell is shown to be stable against radial perturbations. It is shown further that by reversing the roles of inside Reissner-Nordstr\"{o}m and outside Schwarzschild geometries the mass of the appropriate shell becomes positive.The file in this item is the publisher version (published version) of the article.European Physical Journal C: Particles and Fields, Springer2016-01-05T08:20:11Z2016-01-05T08:20:11Z2015-07ArticleS. Habib Mazharimousavi, M. Halilsoy, "Screening of the Reissner-Nordström charge by a thin-shell of dust matter" Eur. Phys. J. C 75, 334 (2015).1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-015-3557-8http://hdl.handle.net/11129/1908en_USSpringer;Eur.Phys.J. C75 (2015) 7, 334
oai:i-rep.emu.edu.tr:11129/19092016-01-06T06:51:52Zhdl_11129_787A topological metric in 2+1-dimensionsMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesReal-valued triplet of scalar fields as source gives rise to a metric which tilts the scalar, not the light cone, in 2+1-dimensions. The topological metric is static, regular and it is characterized by an integer κ=±1,±2,.... The problem is formulated as a harmonic map of Riemannian manifolds in which the integer κ equals to the degree of the map.The file in this item is the publisher version (published version) of the article.European Physical Journal C, Springer2016-01-05T08:33:38Z2016-01-05T08:33:38Z2015ArticleS. Habib Mazharimousavi, M. Halilsoy, "A topological metric in 2+1-dimensions"Eur. Phys. J. C 75, 249 (2015).1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-015-3476-8http://hdl.handle.net/11129/1909en_USSpringer;Eur.Phys.J. C75 (2015) 6, 249
oai:i-rep.emu.edu.tr:11129/19102016-01-07T11:08:25Zhdl_11129_787Einstein-Maxwell gravity coupled to a scalar field in 2+1-dimensionsMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesWe consider Einstein-Maxwell-self-interacting scalar field theory described by a potential V(ϕ) in 2+1−dimensions. The self-interaction potential is chosen to be a highly non-linear double-Liouville type. Exact solutions, including chargeless black holes and singularity-free non-black hole solutions are obtained in this model.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1140/epjp/i2015-15158-5) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.The European Physical Journal Plus, Springer2016-01-05T08:47:48Z2016-01-05T08:47:48Z2015ArticleS. Habib Mazharimousavi and M. Halilsoy, Einstein-Maxwell gravity coupled to a scalar eld in 2+1-dimensions Eur. Phys. J. Plus, 130, 158 (2015).2190-5444DOI: 10.1140/epjp/i2015-15158-5http://hdl.handle.net/11129/1910http://dx.doi.org/10.1140/epjp/i2015-15158-5en_USSpringer;Eur. Phys. J. Plus, 130, 158 (2015)
oai:i-rep.emu.edu.tr:11129/19112016-01-06T06:54:14Zhdl_11129_7872+1-dimensional traversable wormholes supported by positive energyMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesWe revisit the shapes of the throats of wormholes, including thin-shell wormholes (TSWs) in 2+1−dimensions. In particular, in the case of TSWs this is done in a flat 2+1−dimensional bulk spacetime by using the standard method of cut-and-paste. Upon departing from a pure time-dependent circular shape i.e., r=a(t) for the throat, we employ a dependent closed loop of the form r=R(t,θ), and in terms of R(t,θ) we find the surface energy density σ on the throat. For the specific convex shapes we find that the total energy which supports the wormhole is positive and finite. In addition to that we analyze the general wormhole's throat. By considering a specific equation of r=R(θ) instead of r=r0=const., and upon certain choices of functions for R(θ) we find the total energy of the wormhole to be positive.The file in this item is the publisher version (published version) of the article.The European Physical Journal C, Springer2016-01-05T10:53:03Z2016-01-05T10:53:03Z2015ArticleS. Habib Mazharimousavi, M. Halilsoy, "2+1-dimensional traversable wormholes1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-015-3293-0http://hdl.handle.net/11129/1911en_USSpringer;Eur. Phys. J. C 75, 81 (2015)
oai:i-rep.emu.edu.tr:11129/19122016-01-06T06:59:57Zhdl_11129_787Counterrotational effects on stability of 2+1-dimensional thin-shell wormholesMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesThe role of angular momentum in a 2+1-dimensional rotating thin-shell wormhole (TSW) is considered. Particular emphasis is made on stability when the shells (rings) are counterrotating. We find that counter-rotating halves make the TSW supported by the equation of state of a linear gas more stable. Under a small velocity dependent perturbation, however, it becomes unstable.The file in this item is the publisher version (published version) of the article.The European Physical Journal C, Springer2016-01-05T11:03:26Z2016-01-05T11:03:26Z2014ArticleS. HabibMazharimousavi and M. Halilsoy, arXiv:1407.4673 “Counterrotational effects on stability of 2+1-dimensional thin-shell wormholes” Eur. Phys. J. C 74, 3073 (2014).1434-6052 (Online)1434-6044 (Print)DOI: 10.1140/epjc/s10052-014-3073-2http://hdl.handle.net/11129/1912en_USSpringer;Eur. Phys. J. C (2014) 74:3073
oai:i-rep.emu.edu.tr:11129/19132016-01-06T06:48:00Zhdl_11129_787Flare-out conditions in static thin-shell wormholesMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesWe reconsider the generalized flare-out conditions in static wormhole throats given by Hochberg and Visser. We show that due to the presence of matter sources on the throat, these conditions are not applicable to the thin-shell wormholes.The file in this item is the publisher version (published version) of the article.Physical Review D, American Physical Society (APS)2016-01-05T11:10:22Z2016-01-05T11:10:22Z2014ArticleS. HabibMazharimousavi and M. Halilsoy,arXiv:1406.4092“Flare-out conditions in static thin-shell wormholes” Phys. Rev. D 90, 087501 (2014).1550-7998DOI: 10.1103/PhysRevD.90.087501http://hdl.handle.net/11129/1913en_US;Phys. Rev. D 90, 087501 (2014)
oai:i-rep.emu.edu.tr:11129/19142016-01-07T07:13:47Zhdl_11129_787Einstein-Born-Infeld black holes with a scalar hair in three-dimensionsMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesWe present black hole solutions in 2+1−dimensional Einstein's theory of gravity coupled with Born-Infeld nonlinear electrodynamic and a massless self-interacting scalar field. The model has five free parameters: mass M, cosmological constant ℓ, electric q and scalar r0 charges and Born-Infeld parameter β. To attain exact solution for such a highly non-linear system we adjust, i.e. finely tune, the parameters of the theory with the integration constants. In the limit β→0 we recover the results of Einstein-Maxwell-Scalar theory, obtained before. The self interacting potential admits finite minima apt for the vacuum contribution. Hawking temperature of the model is investigated versus properly tuned parameters. By employing this tuned-solution as basis, we obtain also a dynamic solution which in the proper limit admits the known solution in Einstein gravity coupled with self-interacting scalar field. Finally we establish the equations of a general scalar-tensor field coupled to nonlinear electrodynamics field\ in 2+1−dimensions without searching for exact solutions.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1142/S0217732315501771) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Modern Physics Letters A, World Scientific Publishing2016-01-05T11:19:21Z2016-01-05T11:19:21Z2015ArticleS. Habib Mazharimousavi and M. Halilsoy Einstein-Born-Infeld black holes with a scalar hair in three-dimensions Mod. Phys. Lett. A, 30, 1550177 (2015).1434-6044DOI: 10.1142/S0217732315501771http://dx.doi.org/10.1142/S0217732315501771http://hdl.handle.net/11129/1914en_US;Mod. Phys. Lett. A, Vol. 30, No. 33 (2015) 1550177
oai:i-rep.emu.edu.tr:11129/19152016-01-06T06:47:34Zhdl_11129_787Microscopic thin shell wormholes in magnetic Melvin universeMazharimousavi, S. HabibHalilsoy, MustafaAmirabi, Zahrageneral relativitywormholeWe construct thin shell wormholes in the magnetic Melvin universe. It is shown that in order to make a TSW in the Melvin spacetime the radius of the throat can not be larger than 2B0 in which B0 is the magnetic field constant. We also analyze the stability of the constructed wormhole in terms of a linear perturbation around the equilibrium point. In our stability analysis we scan a full set of the Equation of States such as Linear Gas, Chaplygin Gas, Generalized Chaplygin Gas, Modified Generalized Chaplygin Gas and Logarithmic Gas. Finally we extend our study to the wormhole solution in the unified Melvin and Bertotti-Robinson spacetime. In this extension we show that for some specific cases, the local energy density is partially positive but the total energy which supports the wormhole is positive.The file in this item is the publisher version (published version) of the article.European Physical Journal C: Particles and Fields, Springer2016-01-05T12:03:41Z2016-01-05T12:03:41Z2014ArticleS. Habib Mazharimousavi, M. Halilsoy and Z. Amirabi, arXiv:1403.6940 "Micro-scopic thin shell wormholes in magnetic Melvin universe". Eur. Phys. J. C (2014).1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-014-2889-0http://hdl.handle.net/11129/1915en_USSpringer;Eur. Phys. J. C (2014) 74: 2889
oai:i-rep.emu.edu.tr:11129/19162016-01-06T06:44:46Zhdl_11129_787Stability of generic cylindrical thin shell wormholesMazharimousavi, S. HabibHalilsoy, MustafaAmirabi, Zahrageneral relativityblack holesWe revisit the stability analysis of cylindrical thin shell wormholes which have been studied in literature so far. Our approach is more systematic and in parallel to the method which is used in spherically symmetric thin shell wormholes. The stability condition is summarized as the positivity of the second derivative of an effective potential at the equilibrium radius, i.e. V′′(a0)>0. This may serve as the master equation in all stability problems for the cylindrical thin-shell wormholes.The file in this item is the publisher version (published version) of the article.Physical Review D, American Physical Society (APS)2016-01-05T12:26:18Z2016-01-05T12:26:18Z2014ArticleS. Habib Mazharimousavi, M. Halilsoy and Z. Amirabi, arXiv:1403.2861 "Stability of generic cylindrical thin shell wormholes". Physical Review D 89, 084003 (2014).1550-7998DOI: 10.1103/PhysRevD.89.084003http://hdl.handle.net/11129/1916en_US;Physical Review D 89, 084003 (2014)
oai:i-rep.emu.edu.tr:11129/19172016-01-08T03:49:24Zhdl_11129_787Emergent cosmological constant from colliding electromagnetic wavesHalilsoy, MustafaMazharimousavi, S. HabibGürtuğ, Özaygeneral relativitygravitational wavescosmological constantblack holesIn this study we advocate the view that the cosmological constant is of electromagnetic (em) origin, which can be generated from the collision of em shock waves coupled with gravitational shock waves. The wave profiles that participate in the collision have different amplitudes. It is shown that, circular polarization with equal amplitude waves does not generate cosmological constant. We also prove that the generation of the cosmological constant is related to the linear polarization. The addition of cross polarization generates no cosmological constant. Depending on the value of the wave amplitudes, the generated cosmological constant can be positive or negative. We show additionally that, the collision of nonlinear em waves in a particular class of Born-Infeld theory also yields a cosmological constant.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1088/1475-7516/2014/010) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Journal of Cosmology and Astroparticle Physics, Institute of Physics Publishing (IOP)2016-01-05T12:42:03Z2016-01-05T12:42:03Z2014ArticleM. Halilsoy, S. Habib Mazharimousavi, and Ozay Gurtug, "Emergent cosmological constant from colliding electromagnetic waves" JCAP 11, 010 (2014).1475-7516DOI: 10.1088/1475-7516/2014/010http://dx.doi.org/10.1088/1475-7516/2014/11/010http://hdl.handle.net/11129/1917en_USIOP SCIENCE;JCAP11(2014)010
oai:i-rep.emu.edu.tr:11129/19182016-01-08T04:06:04Zhdl_11129_787Quantum probes of timelike naked singularities in the weak field regime of f(R) global monopole spacetimeGürtuğ, ÖzayHalilsoy, MustafaMazharimousavi, S. Habibgeneral relativityblack holesClassical Theories of GravitySpacetime SingularitiesThe formation of a naked singularity in f(R) global monopole spacetime is considered in view of quantum mechanics. Quantum test fields obeying the Klein−Gordon, Dirac and Maxwell equations are used to probe the classical timelike naked singularity developed at r=0. We prove that the spatial derivative operator of the fields fails to be essentially self-adjoint. As a result, the classical timelike naked singularity formed in f(R) global monopole spacetime remains quantum mechanically singular when it is probed with quantum fields having different spin structures. Pitelli and Letelier (Phys. Rev. D 80, 104035, 2009) had shown that for quantum scalar (spin 0% ) probes the general relativistic global monopole singularity remains intact. For specific modes electromagnetic (spin 1) and Dirac field ( 1/2) probes, however, we show that the global monopole spacetime behaves quantum mechanically regular. The admissibility of this singularity is also incorporated within the Gubser's singularity conjecture.The file in this item is the publisher version (published version) of the article.Journal of High Energy Physics, Springer2016-01-05T12:53:21Z2016-01-05T12:53:21Z2014ArticleO. Gurtug, M. Halilsoy, S. Habib Mazharimousavi, arXiv:1312.4453 "Quantum probes of timelike naked singularities in the weak eld regime of f(R) global monopole spacetime". JHEP 01 (2014) 178.1029-8479 (online)DOI: 10.1007/JHEP01(2014)178http://hdl.handle.net/11129/1918en_US;JHEP01(2014)178
oai:i-rep.emu.edu.tr:11129/19192016-01-06T07:02:40Zhdl_11129_787Thin-shell wormholes supported by total normal matterMazharimousavi, S. HabibHalilsoy, Mustafageneral relativitywormholeThe Zipoy-Voorhees-Weyl (ZVW) spacetime characterized by mass (M) and oblateness (δ) is proposed in the construction of viable thin-shell wormholes (TSWs). Departure from spherical / cylindrical symmetry yields positive total energy in spite of the fact that local energy density may take negative values. We show that oblateness of the bumpy sources / black holes can be incorporated as a new degree of freedom that may play role in the resolution of the exotic matter problem in TSWs. Small velocity perturbation reveals, however, that the resulting TSW is unstable.The file in this item is the publisher version (published version) of the article.The European Physical Journal C, Springer2016-01-05T13:14:12Z2016-01-05T13:14:12Z2014ArticleS. Habib Mazharimousavi and M. Halilsoy, "Thin-shell wormholes supported by total normal matter" Eur. Phys. J. C (2014) 74:3067.1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-014-3067-0http://hdl.handle.net/11129/1919en_USSpringer;Eur.Phys.J. C74 (2014) 9, 3067
oai:i-rep.emu.edu.tr:11129/19202016-01-06T07:05:34Zhdl_11129_787A scan of f(R) models admitting Rindler type accelerationMazharimousavi, S. HabibKerachian, MortezaHalilsoy, Mustafageneral relativityblack holesf(r) GravityAs a manifestation of large distance effect Grumiller modified Schwarzschild metric with an extraneous term reminiscent of Rindler acceleration. Such a term has the potential to explain the observed flat rotation curves in general relativity. The same idea has been extended herein to the larger arena of f(R) theory. With particular emphasis on weak energy conditions (WECs) for a fluid we present various classes of f(R) theories admitting a Rindler-type acceleration in the metric.The file in this item is the publisher version (published version) of the article.European Physical Journal C: Particles and Fields, Springer2016-01-05T13:55:50Z2016-01-05T13:55:50Z2014ArticleS. Habib Mazharimousavi, M. Kerachian, M. Halilsoy, arXiv:1309.4768 "A scan of f(R) models admitting Rindler type acceleration". Eur. Phys. J. C, 74 3 (2014) 2795.1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-014-2795-5http://hdl.handle.net/11129/1920en_USSpringer;Eur. Phys. J. C, 74 3 (2014) 2795
oai:i-rep.emu.edu.tr:11129/19212016-01-20T12:17:54Zhdl_11129_787A new Einstein-nonlinear electrodynamics solution in 2+1-dimensionsMazharimousavi, S. HabibHalilsoy, MustafaGürtuğ, Özaygeneral relativityblack holesWe introduce a class of solutions in 2+1−dimensional Einstein-Power-Maxwell theory for circularly symmetric electric field. The electromagnetic field is considered with an angular component given by $% F_{\mu \nu }=E_{0}\delta_{\mu }^{t}\delta_{\nu }^{\theta }$ for E0= constant. First, we show that the metric for zero cosmological constant and the Power-Maxwell Lagrangian of the form of ∣∣FμνFμν∣∣−−−−−−−√, coincides with the solution given in 2+1−% dimensional gravity coupled with a massless, self interacting real scalar field. With the same Lagrangian and a non-zero cosmological constant we obtain a non-asymptotically flat wormhole solution in 2+1−dimensions. The confining motions of massive charged and chargeless particles are investigated too. Secondly, another interesting solution is given for zero cosmological constant together with conformal invariant condition. The formation of timelike naked singularity for this particular case is investigated within the framework of the quantum mechanics. Quantum fields obeying the Klein-Gordon and Dirac equations are used to probe the singularity and test the quantum mechanical status of the singularity.The file in this item is the publisher version (published version) of the article.European Physical Journal C: Particles and Fields, Springer2016-01-05T14:02:26Z2016-01-05T14:02:26Z2014ArticleS. Habib Mazharimousavi, Mustafa Halilsoy and Ozay Gurtug “A new Einstein-nonlinear electrodynamics solution in 2+1-dimensions”, Eur. Phys. J. C 74, 2735 (2014).1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-014-2735-4http://hdl.handle.net/11129/1921en_USSpringer;Eur. Phys. J. C (2014) 74:2735
oai:i-rep.emu.edu.tr:11129/19222016-01-07T07:19:17Zhdl_11129_787Modified Rindler acceleration as a nonlinear electromagnetic effectHalilsoy, MustafaGürtuğ, ÖzayMazharimousavi, S. Habibgeneral relativityblack holesThe model proposed originally by Mannheim and Kazanas for fitting the shapes of galactic rotation curves has recently been considered by Grumiller to describe gravity of a central object at large distances. Herein we employ the same geometry within the context of nonlinear electrodynamics (NED). Pure electrical NED model is shown to generate the novel Rindler acceleration term in the metric which explains anomalous behaviors of test particles / satellites. Remarkably a pure magnetic model of NED yields flat rotation curves that may account for the missing dark matter. Weak and Strong Energy conditions are satisfied in such models of NED.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1016/j.astropartphys.2015.02.006) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Astroparticle Physics, Elsevier2016-01-05T14:16:14Z2016-01-05T14:16:14Z2015ArticleS. Habib Mazharimousavi, O. Gurtug, M. Halilsoy, "Modi ed Rindler acceleration as a nonlinear electromagnetic e¤ect" Astroparticle Physics 68, 1 (2015).0927-6505DOI: 10.1016/j.astropartphys.2015.02.006http://dx.doi.org/10.1016/j.astropartphys.2015.02.006http://hdl.handle.net/11129/1922en_US;Astroparticle Physics 68, 1 (2015)
oai:i-rep.emu.edu.tr:11129/19232016-01-08T00:00:22Zhdl_11129_787Rindler modified Schwarzschild geodesicsHalilsoy, MustafaGürtuğ, ÖzayMazharimousavi, S. Habibgeneral relativityblack holesgeodesicsSchwarzchildThe mysterious attractive constant radial force acted in the past on Pioneer spacecrafts - the so-called Pioneer anomaly - is considered within the context of Rindler acceleration. As an idea this is tempting since it is reminiscent of the cosmological constant. Fortunately the anomalous force acts radially toward the sun so that it differs from the mission of a cosmological constant. Without resorting to the physical source responsible for such a term we investigate the modified Schwarzschild geodesics. The Rindler acceleration naturally affects all massive / massless particle orbits. Stable orbits may turn unstable and vice versa with a finely-tuned acceleration parameter. The overall role of the extra term, given its attractive feature is to provide confinement in the radial geodesics.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10714-013-1593-y) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.General Relativity and Gravitation, Springer2016-01-07T07:38:51Z2016-01-07T07:38:51Z2013ArticleM. Halilsoy, O. Gurtug and S. Habib Mazharimousavi, “Rindler Modified Schwarzschild Geodesics”, General Relativity and Gravitation. Vol. 45, 2363 (2013).1572-9532 (online)0001-7701(print)DOI: 10.1007/s10714-013-1593-yhttp://dx.doi.org/10.1007/s10714-013-1593-yhttp://hdl.handle.net/11129/1923enSpringer;Gen.Rel.Grav. 45 (2013) 2363-2381
oai:i-rep.emu.edu.tr:11129/19242016-01-08T00:00:20Zhdl_11129_787Rindler Type Acceleration in f(R) GravityMazharimousavi, S. HabibHalilsoy, Mustafageneral relativitygravityf(R) gravity; Rindler acceleration; exact solutionsBy choosing a fluid source in f(R) gravity, defined by f(R) = R-12aξ ln|R|, where a (Rindler acceleration) and ξ are both constants, the field equations correctly yield the Rindler acceleration term in the metric. We identify domains in which the weak energy conditions (WEC) and the strong energy conditions (SEC) are satisfied.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1142/S0217732313500739)and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Modern Physics Letters A, World Scientific Publishing2016-01-07T07:52:10Z2016-01-07T07:52:10Z2013ArticleS. Habib Mazharimousavi and M. Halilsoy, arXiv:1302.2545, "Rindler type acceleration in f(R) gravity" Mod. Phys. Lett. A, Vol. 28, No. 17 (2013) 1350073.1793-6632 (online)0217-7323 (print)DOI: 10.1142/S0217732313500739http://dx.doi.org/10.1142/S0217732313500739http://hdl.handle.net/11129/1924en_USWorld Scientific;Mod. Phys. Lett. A 28, 1350073 (2013)
oai:i-rep.emu.edu.tr:11129/19252016-01-08T00:00:21Zhdl_11129_787Charge screening by thin-shells in a 2+1-dimensional regular black holeMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesthin-shellsWe consider a particular Bardeen black hole in 2+1-dimensions. The black hole is sourced by a radial electric field in non-linear electrodynamics (NED). The solution is obtained anew by the alternative Hamiltonian formalism. For r→∞ it asymptotes to the charged BTZ black hole. It is shown that by inserting a charged, thin-shell (or ring) the charge of the regular black hole can be screened from the external world.The file in this item is the publisher version (published version) of the article.European Physical Journal C, Springer2016-01-07T08:00:41Z2016-01-07T08:00:41Z2013ArticleS. HabibMazharimousavi and M. Halilsoy, arXiv:1305.2909. "Charge screening by thin-shells in a 2+1-dimensional regular black hole". Eur. Phys. J. C (2013) 73: 25271434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-013-2527-2http://hdl.handle.net/11129/1925en_USSpringer;Eur. Phys. J. C (2013) 73: 2527
oai:i-rep.emu.edu.tr:11129/19262016-01-08T00:00:25Zhdl_11129_787Unified Bertotti-Robinson and Melvin SpacetimesHalilsoy, MustafaMazharimousavi, S. Habibgeneral relativityMelvin SpacetimesBertotti-RobinsonEinstein-MaxwellWe present a solution for the Einstein-Maxwell (EM) equations which unifies both the magnetic Bertotti-Robinson (BR) and Melvin (ML) solutions as a single metric in the axially symmetric coordinates t,ρ,z,φ. Depending on the strength of magnetic field the spacetime manifold, unlike the cases of separate BR and ML spacetime, develops singularity on the symmetry axis (ρ=0). Our analysis shows, beside other things that there are regions inaccessible to all null geodesics.The file in this item is the publisher version (published version) of the article.Physical Review D, American Physical Society (APS)2016-01-07T08:11:15Z2016-01-07T08:11:15Z2013ArticleM. Halilsoy and S. HabibMazharimousavi, arXiv:1211.6983 "Unified Bertotti-Robinson and Melvin Spacetimes". Phys. Rev. D 88, 064021 (2013).1550-7998DOI: 10.1103/PhysRevD.88.064021http://hdl.handle.net/11129/1926en_US;Phys. Rev. D 88, 064021 (2013)
oai:i-rep.emu.edu.tr:11129/19272016-01-08T00:00:25Zhdl_11129_787Comment on "Static and spherically symmetric black holes in f(R) theories"Mazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesWe consider the interesting ‘‘near-horizon test’’ reported in S. E. P. Bergliaffa and Y. E. C. de O. Nunes,Phys. Rev. D 84, 084006 (2011) for any static, spherically symmetric black hole solution admitted in f(R)gravity. Before adopting the necessary conditions for the test, however, revisions are needed as we point out in this Comment.The file in this item is the publisher version (published version) of the article.Physical Review D, American Physical Society (APS)2016-01-07T08:22:51Z2016-01-07T08:22:51Z2012ArticleS. HabibMazharimousavi and M. Halilsoy, arXiv:1210.4699. "Comment on "Staticand spherically symmetric black holes in f(R) theories"". Phys. Rev. D 86, 088501 (2012).1550-7998DOI: 10.1103/PhysRevD.86.088501http://hdl.handle.net/11129/1927en_US;Phys. Rev. D 86, 088501 (2012)
oai:i-rep.emu.edu.tr:11129/19282016-01-08T03:57:50Zhdl_11129_787Existence of Reissner-Nordstrom type black holes in f(R) gravityMazharimousavi, S. HabibHalilsoy, MustafaKerachian, Mortezageneral relativityblack holesf(r) GravityReissner–NordstromWe investigate the existence of Reissner-Nordstr\"om (RN) type black holes in f(R) gravity. Our emphasis is to derive, in the presence of electrostatic source, the necessary conditions which provide such static, spherically symmetric (SSS) black holes available in f(R) gravity. We also study the thermodynamics of the black hole solutionThe file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1142/S0218271813500570)and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.International Journal of Modern Physics D, World Scientific Publishing2016-01-07T08:52:36Z2016-01-07T08:52:36Z2013ArticleS. Habib Mazharimousavi, M. Kerachian and M. Halilsoy, arXiv:1210.4696 "Existence of Reissner-Nordstrom type black holes in f(R) gravity". Int. J. Modern Physics D 22, 1350057 (2013).1793-6594 (online)0218-2718 (print)http://hdl.handle.net/11129/1928http://dx.doi.org/10.1142/S0218271813500570en_USWorld Scientific;Int. J. Modern Physics D 22, 1350057 (2013)
oai:i-rep.emu.edu.tr:11129/19292016-01-08T00:00:25Zhdl_11129_787Double-bounce domain-wall in Einstein-Yang-Mills-Scalar black holesMazharimousavi, S. HabibHalilsoy, MustafaTahamtan, Tayabehgeneral relativityblack holesWe find Einstein-Yang-Mills (EYM) black hole solutions endowed with massless scalar hair in the presence of a potential V(ϕ) as function of the scalar field ϕ. Choosing V(ϕ)=constant (or zero) sets the scalar field to vanish leaving us with the EYM black holes. Our class of black hole solutions is new so that they do not asymptote in general to any known limits. Particular case is given, however, which admits an asymptotically anti de Sitter limit in 6−dimensional spacetime. The role of the potential V(ϕ) in making double bounces (i.e. both a minimum and maximum radii) on a Domain Wall (DW) universe is highlighted.The file in this item is the publisher version (published version) of the article.European Physical Journal C, Springer2016-01-07T09:17:38Z2016-01-07T09:17:38Z2013ArticleS. Habib Mazharimousavi, M. Halilsoy and T. Tahamtan (2012) arXiv:1207.1644 "Double-bounce domain-wall in Einstein-Yang-Mills-Scalar black holes". Eur. Phys. J. C (2013) 73, 2264.1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-012-2264-yhttp://hdl.handle.net/11129/1929en_USSpringer;Eur. Phys. J. C (2013) 73, 2264
oai:i-rep.emu.edu.tr:11129/19302016-01-08T00:00:25Zhdl_11129_787Ground State H-Atom in Born-Infeld TheoryMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityBorn-Infeld TheoryH-atomHydrogen atom, Nonlinear electrodynamicsWithin the context of Born-Infeld (BI) nonlinear electrodynamics (NED)
we revisit the non-relativistic, spinless H-atom. The pair potential computed from the
Born-Infeld equations is approximated by the Morse type potential with remarkable
fit over the critical region where the convergence of both the short and long distance
expansions slows down dramatically. The Morse potential is employed to determine
both the ground state energy of the electron and the BI parameter.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10701-011-9623-7) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Foundations of Physics, Springer2016-01-07T09:33:21Z2016-01-07T09:33:21Z2012ArticleS. Habib Mazharimousavi and M. Halilsoy, arXiv:0810.0818 "Ground State H- Atom in Born-Infeld Theory". Found. Phys. 42 (2012) 524.1572-9516 (online)0015-9018 (print)DOI: 10.1007/s10701-011-9623-7http://dx.doi.org/10.1007/s10701-011-9623-7http://hdl.handle.net/11129/1930en_USSpringer;Foundations of Physics April 2012, Volume 42, Issue 4, pp 524-530
oai:i-rep.emu.edu.tr:11129/19312016-01-11T12:31:07Zhdl_11129_787Fading Hawking RadiationSakallı, İzzetHalilsoy, MustafaPaşaoğlu, Halegeneral relativityhawking radiationInformation paradoxLinear dilaton black holeTunneling formalismQuantum correctionsIn this study, we explore a particular type Hawking radiation which ends with zero temperature and entropy. The appropriate black holes for this purpose are the linear dilaton black holes. In addition to the black hole choice, a recent formalism in which the Parikh-Wilczek's tunneling formalism amalgamated with quantum corrections to all orders in \hbar is considered. The adjustment of the coefficients of the quantum corrections plays a crucial role on this particular Hawking radiation. The obtained tunneling rate indicates that the radiation is not pure thermal anymore, and hence correlations of outgoing quanta are capable of carrying away information encoded within them. Finally, we show in detail that when the linear dilaton black hole completely evaporates through such a particular radiation, entropy of the radiation becomes identical with the entropy of the black hole, which corresponds to "no information loss".The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10509-012-1028-3) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Astrophysics and Space Science, Springer2016-01-07T11:50:36Z2016-01-07T11:50:36Z2012Article“Fading Hawking Radiation” Izzet Sakalli, Mustafa Halilsoy and Hale Pasaoglu. Astrophy. Space Sci. (2012) 340, 155.1572-946X (online)0004-640X (print)DOI: 10.1007/s10509-012-1028-3http://dx.doi.org/10.1007/s10509-012-1028-3http://hdl.handle.net/11129/1931en_USSpringer;Astrophys. Space Sci. 340, 155 (2012)
oai:i-rep.emu.edu.tr:11129/19322016-01-08T00:00:24Zhdl_11129_787'Square Root' of the Maxwell Lagrangian versus confinement in general relativityMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesWe employ the 'square root' of the Maxwell Lagrangian (i.e. \surd(F_{{\mu}{\nu}}F^{{\mu}{\nu}})), coupled with gravity to search for the possible linear potentials which are believed to play role in confinement. It is found that in the presence of magnetic charge no confining potential exists in such a model. Confining field solutions are found for radial geodesics in pure electrically charged Nariai- Bertotti-Robinson (NBR)-type spacetime with constant scalar curvature. Recently, Guendelman, Kaganovich, Nissimov and Pacheva, [Phys.Lett.B704(2011)230] have shown that superposed square root with standard Maxwell Lagrangians yields confining potentials in spherically symmetric spacetimes with new generalized Reissner-Nordstr\"om-de Sitter / -anti-de Sitter black hole solutions. In NBR spacetimes we show that confining potentials exist even when the standard Maxwell Lagrangian is relaxed.The file in this item is the publisher version (published version) of the article.Physics Letters B, Elsevier2016-01-07T11:58:09Z2016-01-07T11:58:09Z2012Article“Square Root of the Maxwell Lagrangian versus confinement in general relativity” S. H. Mazharimousavi, M. Halilsoy. Phys. Lett. B. 710 (2012) 489-492.0370-2693DOI: 10.1016/j.physletb.2012.03.030http://hdl.handle.net/11129/1932en_USElsevier;Physics Letters B 710 (2012) 489-492
oai:i-rep.emu.edu.tr:11129/19352016-01-08T00:00:25Zhdl_11129_787Solutions for f(R) gravity coupled with electromagnetic fieldMazharimousavi, S. HabibHalilsoy, MustafaTahamtan, Tayebehgeneral relativityf(r) gravityIn the presence of external, linear / nonlinear electromagnetic fields we integrate f(R) \sim R+2{\alpha}\surd(R+const.) gravity equations. In contrast to their Einsteinian cousins the obtained black holes are non-asymptotically flat with a deficit angle. In proper limits we obtain from our general solution the global monopole solution in f(R) gravity. The scale symmetry breaking term adopted as the nonlinear electromagnetic source adjusts the sign of the mass of the resulting black hole to be physical.The file in this item is the publisher version (published version) of the article.European Physical Journal C, Springer2016-01-07T12:16:03Z2016-01-07T12:16:03Z2012Article“Solutions for f(R), gravity coupled with electromagnetic field” S. H. Mazharimousavi, M. Halilsoy and T. Tahamtan. Eur. Phys. J.C. (2012)72:1851.1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-011-1851-7http://hdl.handle.net/11129/1935enSpringer;Eur. Phys. J. C. 72, 1851 (2012)
oai:i-rep.emu.edu.tr:11129/19362016-01-08T00:00:25Zhdl_11129_787Constant curvature f(R) gravity minimally coupled with Yang-Mills fieldMazharimousavi, S. HabibHalilsoy, MustafaTahamtan, Tayebehgeneral relativityblack holesf(r) GravityYang-Mills fieldWe consider the particular class of f(R) gravities minimally coupled with Yang - Mills (YM) field in which the Ricci scalar =R_{0}= constant in all dimensions d\geq4. Even in this restricted class the spacetime has unlimited scopes determined by an equation of state of the form P_{eff}={\omega}{\rho}. Depending on the distance from the origin (or horizon of a black hole) the state function {\omega}(r) takes different values. It is observed that {\omega}\rightarrow(1/3) (the ultra relativistic case in 4 - dimensions) and {\omega}\rightarrow-1 (the cosmological constant) are the limiting values of our state function {\omega}(r) in a spacetime centered by a black hole. This suggests that having a constant {\omega} throughout spacetime around a charged black hole in f(R) gravity with constant scalar curvature is a myth.The file in this item is the publisher version (published version) of the article.European Physical Journal C, Springer2016-01-07T12:37:17Z2016-01-07T12:37:17Z2011Article“Constant curvature f(R) gravity minimally coupled with Yang – Mills field”. S. H. Mazharimousavi, M. Halilsoy, T. Tahamtan, Eur. Phys. J.C (2011), 72:1958.1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-012-1958-5http://hdl.handle.net/11129/1936en_USSpringer;Eur. Phys. J. C (2012) 72:1958
oai:i-rep.emu.edu.tr:11129/19382016-01-08T00:00:21Zhdl_11129_787Regular charged black hole construction in 2+1 -dimensionsMazharimousavi, S. HabibHalilsoy, MustafaTahamtan, Tayebehgeneral relativityblack holesRegular charged blackBTZ black holeNonlinear electrodynamicsExact solutionIt is well-known that unlike its chargeless version the charged Banados-Teitelboim-Zanelli (BTZ) black hole solution in 2+1- dimensional spacetime is singular. We construct a charged, regular extension of the BTZ black hole solution by employing nonlinear Born-Infeld electrodynamics, supplemented with the Hoffmann term and gluing different spacetimes. The role of the latter term is to divide spacetime in a natural way into two regions by a circle and eliminate the inner singularity. Thermodynamics of such a black hole is investigated by Kaluza-Klein reduction to the 1+1-dimensional dilaton gravity.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1016/j.physleta.2012.01.001) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Physics Letters A, Elsevier2016-01-07T13:59:52Z2016-01-07T13:59:52Z2012Article“Regular, charged, black hole construction in 2+1 – dimensions”. S.H. Mazharimousavi, M. Halilsoy, T. Tahamtan. Phys. Lett. A. 376, (2012) 893-898.0375-9601DOI: 10.1016/j.physleta.2012.01.001http://dx.doi.org/10.1016/j.physleta.2012.01.001http://hdl.handle.net/11129/1938en_USElsevier;Physics Letters A 376 (2012) 893
oai:i-rep.emu.edu.tr:11129/19422016-01-08T00:00:30Zhdl_11129_787Black hole solutions in f(R) gravity coupled with non-linear Yang-Mills fieldMazharimousavi, S. HabibHalilsoy, Mustafageneral relativityblack holesIt is shown that in the static, spherically symmetric spacetime the problem of metric f(R) gravity coupled with non-linear Yang-Mills (YM) field constructed from the Wu-Yang ansatz as source, can be solved in all dimensions. By non-linearity it is meant that the YM Lagrangian depends arbitrarily on its invariant. A particular form is considered to be in the power-law form with limit of the standard YM theory. The formalism admits black hole solutions with single or double horizons in which f(R) can be obtained, in general numerically. In 6-dimensional case we obtain an exact solution given by f(R)=\surdR gravity that couples with the YM field in a consistent manner.The file in this item is the publisher version (published version) of the article.Physical Review D, American Physical Society (APS)2016-01-07T14:21:59Z2016-01-07T14:21:59Z2011ArticleS. Habib Mazharimousavi and M. Halilsoy (2011) arXiv:1105.3659 "Black hole solutions in f(R) gravity coupled with non-linear Yang-Mills eld", Phys. Rev. D 84 (2011) 064032.1550-7998DOI: 10.1103/PhysRevD.84.064032http://hdl.handle.net/11129/1942en_US;Phys. Rev. D 84, 064032 (2011)
oai:i-rep.emu.edu.tr:11129/19572016-01-12T00:00:27Zhdl_11129_787Stable Magnetic Universes RevisitedTahamtan, TayebehHalilsoy, Mustafageneral relativityuniverseMagnetic universePerturbationGravitational confinementA regular class of static, cylindrically symmetric pure magnetic field metrics is rederived in a different metric ansatz in all dimensions. Radial, time dependent perturbations show that for dimensions d>3 such spacetimes are stable at both near r\approx0 and large radius r\rightarrow\infty. In a different gauge these stability analysis and similar results were known beforehand. For d=3, however, simultaneous stability requirement at both, near and far radial distances can not be reconciled for time - dependent perturbations. Restricted, numerical geodesics for neutral particles reveal a confinement around the center in the polar plane. Charged, time-like geodesics for d=4 on the other hand are shown numerically to run toward infinity.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10509-012-1217-0) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Astrophysics and Space Science, Springer2016-01-11T11:25:49Z2016-01-11T11:25:49Z2013ArticleT. Tahamtan, M.Halilsoy, Astrophysics and Space Science Vol: 343 Issue: 1, 435-443 (2013). “Stable magnetic universes revisited”1572-946X (online)0004-640X (print)10.1007/s10509-012-1217-0http://dx.doi.org/10.1007/s10509-012-1217-0http://hdl.handle.net/11129/1957en_USSpringer;Astrophysics and Space Science January 2013, Volume 343, Issue 1, pp 435-443
oai:i-rep.emu.edu.tr:11129/19582016-01-12T00:00:28Zhdl_11129_7872+1 dimensional magnetically charged solutions in Einstein - Power - Maxwell theoryMazharimousavi, S. HabibGürtuğ, ÖzayHalilsoy, MustafaÜnver, Özlemgeneral relativityblack holesWe obtain a class of magnetically charged solutions in 2+1 dimensional Einstein - Power - Maxwell theory. In the linear Maxwell limit, such horizonless solutions are known to exist. We show that in 3D geometry, black hole solutions with magnetic charge does not exist even if it is sourced by power-Maxwell field. Physical properties of the solution with particular power k of the Maxwell field is investigated. The true timelike naked curvature singularity develops when k>1 which constitutes one of the striking effects of the power Maxwell field. For specific power parameter k, the occurrence of timelike naked singularity is analysed in quantum mechanical point of view. Quantum test fields obeying the Klein - Gordon and the Dirac equations are used to probe the singularity. It is shown that the class of static pure magnetic spacetime in the power Maxwell theory is quantum mechanically singular when it is probed with fields obeying Klein-Gordon and Dirac equations in the generic case.The file in this item is the publisher version (published version) of the article.Physical Review D, Springer2016-01-11T11:43:27Z2016-01-11T11:43:27Z2011Article“2+1 – Dimensional magnetically charged solutions in Einstein – Power – Maxwell theory”. S. Habib Mazharimousavi, Ozay Gurtug, Mustafa Halilsoy and Ozlem Unver, Phys. Rev. D 84, 124021 (2011).1550-7998DOI: 10.1103/PhysRevD.84.124021http://hdl.handle.net/11129/1958en_US;Phys. Rev. D 84, 124021 (2011)
oai:i-rep.emu.edu.tr:11129/19592016-01-14T00:00:20Zhdl_11129_787Absorption cross-section and decay rate of rotating linear dilaton black holesSakalli, IzzetAslan, Onur Atillageneral relativityblack holescross-sectionrotating linear dilaton black holesGreybody factorKlein–Gordon equationWe analytically study the scalar perturbation of non-asymptotically flat (NAF) rotating linear dilaton black holes (RLDBHs) in 4-dimensions. We show that both radial and angular wave equations can be solved in terms of the hypergeometric functions. The exact greybody factor (GF), the absorption cross-section (ACS), and the decay rate (DR) for the massless scalar waves are computed for these black holes (BHs). The results obtained for ACS and DR are discussed through graphs.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1016/j.astropartphys.2015.10.005) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Astroparticle Physics, Elsevier2016-01-11T12:12:49Z2016-01-11T12:12:49Z2016Article"Absorption Cross-section and Decay Rate of Rotating Linear Dilaton Black Holes " Izzet Sakalli and Onur Atilla Aslan, Astropart. Phys. 74, 73 (2016). (DOI:10.1016/j.astropartphys.2015.10.005).0927-6505DOI: 10.1016/j.astropartphys.2015.10.005http://dx.doi.org/10.1016/j.astropartphys.2015.10.005http://hdl.handle.net/11129/1959en_USElsevier;Astropart.Phys. 74 (2016) 73-78
oai:i-rep.emu.edu.tr:11129/19602016-01-12T00:00:29Zhdl_11129_787Resonance Spectra of Caged Stringy Black Hole and Its SpectroscopySakallı, İzzetTokgöz, Gülnihalgeneral relativityCaged Stringy Black HoleSpectroscopyquasinormal modeMaggiore’s method (MM), which evaluates the transition frequency that appears in the adiabatic invariant from the highly damped quasinormal mode (QNM) frequencies, is used to investigate the entropy/area spectra of the Garfinkle–Horowitz–Strominger black hole (GHSBH). Instead of the ordinary QNMs, we compute the boxed QNMs (BQNMs) that are the characteristic resonance spectra of the confined scalar fields in the GHSBH geometry. For this purpose, we assume that the GHSBH has a confining cavity (mirror) placed in the vicinity of the event horizon. We then show how the complex resonant frequencies of the caged GHSBH are computed using the Bessel differential equation that arises when the scalar perturbations around the event horizon are considered. Although the entropy/area is characterized by the GHSBH parameters, their quantization is shown to be independent of those parameters. However, both spectra are equally spaced.The file in this item is the publisher version (published version) of the article.Hindawi Publishing Corporation2016-01-11T12:23:35Z2016-01-11T12:23:35Z2015Article"Resonance Spectra of Caged Stringy Black Hole and Its Spectroscopy", Izzet Sakalli and Gulnihal Tokgoz, Advances in High Energy Physics, Vol. 2015, Article ID 739153, 7pages, 2015.1687-7357DOI: 10.1155/2015/739153http://hdl.handle.net/11129/1960en_US;Adv.High Energy Phys. 2015 (2015) 739153
oai:i-rep.emu.edu.tr:11129/19612016-01-12T00:00:28Zhdl_11129_787Quantization of rotating linear dilaton black holesSakallı, İzzetQuantizationrotating linear dilaton black holesgeneral relativityblack holesquasinormal modeIn this paper, we focus on the quantization of 4−dimensional rotating linear dilaton black hole (RLDBH) spacetime describing an action, which emerges in the Einstein-Maxwell-Dilaton-Axion (EMDA) theory. RLDBH spacetime has a non-asymptotically flat (NAF) geometry. When the rotation parameter " a" vanishes, the spacetime reduces to its static form, the so-called linear dilaton black hole (LDBH) metric. Under scalar perturbations, we show that the radial equation reduces to a hypergeometric differential equation. Using the boundary conditions of the quasinormal modes (QNMs), we compute the associated complex frequencies of the QNMs. In a particular case, QNMs are applied in the rotational adiabatic invariant quantity, and we obtain the quantum entropy/area spectra of the RLDBH. Both spectra are found to be discrete and equidistant, and independent of a−parameter despite the modulation of QNMs by this parameter.The file in this item is the publisher version (published version) of the article.European Physical Journal C, Springer2016-01-11T12:38:44Z2016-01-11T12:38:44Z2015Article"Quantization of Rotating Linear Dilaton Black Holes", Izzet Sakalli, Eur. Phys. J. C 75, 144 (2015).1434-6052 (online)1434-6044 (print)DOI: 10.1140/epjc/s10052-015-3369-xhttp://hdl.handle.net/11129/1961en_US;Eur. Phys. J. C 75, 144 (2015)
oai:i-rep.emu.edu.tr:11129/19622016-01-12T00:00:29Zhdl_11129_787Spectroscopy of Rindler Modified Schwarzschild Black HoleSakallı, İzzetMirekhtiary, Seyedeh Fatemehgeneral relativityblack holesSpectroscopyquasinormal modesWe study quasinormal modes (QNMs) of uncharged Grumiller black hole (GBH). This massive BH has a Rindler acceleration a, and hence it is also called Rindler modified Schwarzschild BH. After reducing the radial equation of the massless Klein-Gordon equation to the Zerilli equation, we compute the complex frequencies of the QNMs of the GBH. To this end, an approximation method which considers small perturbation around its horizon is used. Considering the highly damped QNMs in the process proposed by Maggiore, the quantum entropy and area spectra of these BHs are found. Although the QNM frequencies are tuned by the Rindler term, we show in detail that the spacing does not depend on it. Here, dimensionless constant {\epsilon} of the area spectrum is found to be double of its Schwarzschild value. The latter result is also discussed.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10509-013-1776-8) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Astrophysics and Space Science, Springer2016-01-11T12:48:17Z2016-01-11T12:48:17Z2014Article"Spectroscopy of Rindler Modified Schwarzschild Black Hole", " Izzet Sakalli and Seyedeh Fatemeh Mirekhtiary, Astrophys. Space Sci. 350, 727 (2014).1572-946X (online)0004-640X (print)DOI: 10.1007/s10509-013-1776-8http://dx.doi.org/10.1007/s10509-013-1776-8http://hdl.handle.net/11129/1962en_USSpringer;Astrophys. Space Sci. 350 (2), 727-731 (2014)
oai:i-rep.emu.edu.tr:11129/19632016-01-12T00:00:29Zhdl_11129_787Hawking Radiation of Grumiller Black HoleMirekhtiary, Seyedeh FatemehSakallı, İzzetgeneral relativityblack holeshawking radiationquantum tunnelingIn this paper, we consider the relativistic Hamilton-Jacobi (HJ) equation and study the Hawking radiation (HR) of scalar particles from uncharged Grumiller black hole (GBH) which is affordable for testing in astrophysics. GBH is also known as Rindler modified Schwarzschild BH. Our aim is not only to investigate the effect of the Rindler parameter a on the Hawking temperature (TH), but to examine whether there is any discrepancy between the computed horizon temperature and the standard TH as well. For this purpose, in addition to its naive coordinate system, we study on the three regular coordinate systems which are Painleve-Gullstrand (PG), ingoing Eddington-Finkelstein (IEF) and Kruskal-Szekeres (KS) coordinates. In all coordinate systems, we calculate the tunneling probabilities of incoming and outgoing scalar particles from the event horizon by using the HJ equation. It has been shown in detail that the considered HJ method is concluded with the conventional TH in all these coordinate systems without giving rise to the famous factor-2 problem. Furthermore, in the PG coordinates Parikh-Wilczek's tunneling (PWT) method is employed in order to show how one can integrate the quantum gravity (QG) corrections to the semiclassical tunneling rate by including the effects of self-gravitation and back reaction. We then show how these corrections yield a modification in the TH.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1088/0253-6102/61/5/03) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Communications in Theoretical Physics, Institute of Physics (IOP) Publishing2016-01-11T13:08:28Z2016-01-11T13:08:28Z2014Article"Hawking Radiation of Grumiller Black Hole" Seyedeh Fatemeh Mirekhtiary and Izzet Sakalli, Comm. Theor. Phys. 61, 558 (2014).0253-6102DOI: 10.1088/0253-6102/61/5/03http://dx.doi.org/10.1088/0253-6102/61/5/03http://hdl.handle.net/11129/1963en_USIOP SCIENCE;Commun. Theor. Phys. 61, 558, 2014
oai:i-rep.emu.edu.tr:11129/19642016-01-13T00:00:24Zhdl_11129_787Effect of the Refractive Index on the Hawking Temperature: An Application of the Hamilton-Jacobi MethodSakallı, İzzetMirekhtiary, Seyedeh Fatemehgeneral relativityblack holeshawking radiationquantum tunnelingSolid State Physics, Physics, Elementary Particles, Quantum Field Theory, Classical and Quantum GravitationRelativity Theory, Particle and Nuclear Physics, Nuclear radiation, Equipment and suppliesFiber optics, Methods, General Relativity and Quantum CosmologyHawking radiation of a non-asymptotically flat (NAF) 4-dimensional spherically symmetric and static dilatonic black hole (BH) via the Hamilton-Jacobi (HJ) method has been studied. In addition to the naive coordinates, we have used four more different coordinate systems which are well-behaved at the horizon. Except the isotropic coordinates, direct computation of the HJ method leads us the standard Hawking temperature for all coordinate systems. The isotropic coordinates render possible to get the index of refraction extracting from the Fermat metric. It is explicitly shown that the index of refraction determines the value of the tunneling rate and its natural consequence, Hawking temperature. The isotropic coordinates within the conventional HJ method produce wrong result for the temperature of the dilatonic BH. Here, we explain how this discrepancy can be resolved by regularizing the integral possessing a pole at the horizon.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1134/S1063776113120066) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Journal of Experimental and Theoretical Physics (JETP), Springer2016-01-12T15:26:36Z2016-01-12T15:26:36Z2013Article"Effect of the Refractive Index on the Hawking Temperature: An Application of the Hamilton-Jacobi Method" Izzet Sakalli and S.F. Mirekhtiary, J. Exp. Theor. Phys 117 (4), 656 (2013).1090-6509 (online)1063-7761 (print)DOI: 10.1134/S1063776113120066http://dx.doi.org/10.1134/S1063776113120066http://hdl.handle.net/11129/1964en_US;Journal of Experimental and Theoretical Physics, 117, 656, 2013
oai:i-rep.emu.edu.tr:11129/19652016-01-13T00:00:26Zhdl_11129_787Quasinormal modes of charged dilaton black holes and their entropy spectraSakallı, İzzetgeneral relativityblack holesentropy spectraQuasinormal modesGeneral Relativity and Quantum CosmologyIn this study, we employ the scalar perturbations of the charged dilaton black hole (CDBH) found by Chan, Horne and Mann (CHM), and described with an action which emerges in the low-energy limit of the string theory. A CDBH is neither asymptotically flat (AF) nor non-asymptotically flat (NAF) spacetime. Depending on the value of its dilaton parameter "a", it has both Schwarzschild and linear dilaton black hole (LDBH) limits. We compute the complex frequencies of the quasinormal modes (QNMs) of the CDBH by considering small perturbations around its horizon. By using the highly damped QNMs in the process prescribed by Maggiore, we obtain the quantum entropy and area spectra of these BHs. Although the QNM frequencies are tuned by "a", we show that the quantum spectra do not depend on "a", and they are equally spaced. On the other hand, the obtained value of undetermined dimensionless constant {\epsilon} is the double of Bekenstein's result. The possible reason of this discrepancy is also discussed.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1142/S0217732313501095) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Modern Physics Letters A, World Scientific Publishing2016-01-12T15:37:09Z2016-01-12T15:37:09Z2013Article“Quasinormal Modes of Charged Dilaton Black Holes and Their Entropy Spectra”, Izzet Sakalli, Mod. Phys. Lett. A 28, 1350109 (2013).0217-7323DOI: 10.1142/S0217732313501095http://dx.doi.org/10.1142/S0217732313501095http://hdl.handle.net/11129/1965en_USWorld Scientific;Modern Physics Letters A, 2013, vol. 28, issue 27, p 1,
oai:i-rep.emu.edu.tr:11129/19662016-01-14T00:00:25Zhdl_11129_787Effect of the cosmological constant in the Hawking radiation of 3D charged dilaton black holeSakallı, İzzetgeneral relativityblack holeshawking radiationquantum tunnelingCosmological constantCharged dilaton black holeRadiation spectrumThis paper deals with the semiclassical radiation spectrum of static and circularly symmetric 3D charged dilaton black holes with cosmological constant {\Lambda} in non-asymptotically flat spacetimes. We first review the 3D charged dilaton black holes which are solution to low-energy string action. The wave equation of a massless scalar field is shown to be exactly solvable in terms of hypergeometric functions. Thus, the radiation spectrum and its corresponding temperature are obtained, precisely. Computations at high frequency regime show that the radiation spectrum yields the Hawking temperature of the black hole with no charge. Unlike the chargeless case, the Hawking temperature of the charged dilaton black holes is derived from the radiation spectrum at the low frequencies. The utmost importance of the {\Lambda} in the latter result is highlighted.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10509-012-1053-2) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Astrophysics and Space Science, Springer2016-01-13T11:45:08Z2016-01-13T11:45:08Z2012Article“Effect of the Cosmological Constant in the Hawking Radiation of 3D Charged Dilaton Black Hole”, Izzet Sakalli, Astrophys. Space Sci. 340, 317 (2012).1572-946X (online)0004-640X (print)DOI: 10.1007/s10509-012-1053-2http://dx.doi.org/10.1007/s10509-012-1053-2http://hdl.handle.net/11129/1966en_USSpringer;Astrophys. Space Sci. 340, 317 (2012)
oai:i-rep.emu.edu.tr:11129/19672016-01-14T00:00:24Zhdl_11129_787Quantization of Higher Dimensional Linear Dilaton Black Hole Area/Entropy From Quasinormal ModesSakallı, İzzetgeneral relativityhawking radiationQuasinormal ModesThe quantum spectra of area and entropy of higher dimensional linear dilaton black holes in various theories via the quasinormal modes method are studied. It is shown that quasinormal modes of these black holes can reveal themselves when a specific condition holds. Finally, we obtain that a higher dimensional linear dilaton black hole has equidistant area and entropy spectra, and both of them are independent on the spacetime dimension.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1142/S0217751X13920024) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.International Journal of Modern Physics A, World Scientific Publishing2016-01-13T11:58:29Z2016-01-13T11:58:29Z2013Article“Quantization of Higher-Dimensional Linear Dilaton Black Hole Area/Entropy From Quasinormal Modes”, Izzet Sakalli, Int. J. Mod. Phys. A 26, 2263 (2011); Erratum: Int. Jour.Mod. Phys. A 28 (12), (2013).0217-751XDOI: 10.1142/S0217751X13920024http://dx.doi.org/10.1142/S0217751X13920024http://hdl.handle.net/11129/1967en_US;IJMPA Volume: 26, Issue: 13 pp. 2263-2269, 2011; 28, 1392002 (2013), Erratum
oai:i-rep.emu.edu.tr:11129/19682016-01-14T00:00:25Zhdl_11129_787Dilatonic Entropic ForceSakallı, İzzetgeneral relativityblack holesEntropic ForceDilaton fieldsHolographic screensCharged Dilaton black holesWe show in detail that the entropic force of the static spherically symmetric spacetimes with unusual asymptotics can be calculated through the Verlinde's arguments. We introduce three different holographic screen candidates, which are first employed thoroughly by Myung and Kim [Phys. Rev. D 81, 105012 (2010)] for Schwarzschild black hole solutions, in order to identify the entropic force arising between a charged dilaton black hole and a test particle. The significance of the dilaton parameter on the entropic force is highlighted, and shown graphically.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10773-011-0731-0) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.International Journal of Theoretical Physics, Springer2016-01-13T12:42:40Z2016-01-13T12:42:40Z2011Article“Dilatonic Entropic Force”, Izzet Sakalli, Int. J. Theo. Phys. 50, 2426 (2011).1572-9575 (online)0020-7748 (print)DOI: 10.1007/s10773-011-0731-0http://dx.doi.org/10.1007/s10773-011-0731-0http://hdl.handle.net/11129/1968en_US;Int.J.Theor.Phys.50:2426-2437,2011
oai:i-rep.emu.edu.tr:11129/19692016-01-14T00:00:26Zhdl_11129_787Entropy Conservation of Linear Dilaton Black Holes in Quantum Corrected Hawking RadiationSakallı, İzzetPaşaoğlu, HaleHalilsoy, Mustafageneral relativityblack holeshawking radiationquantum tunnelingInformation loss paradoxEntropy conservationParikh-Wilczek’s tunneling methodQuantum gravity effectLinear dilaton black holeIt has been shown recently that information is lost in the Hawking radiation of the linear dilaton black holes in various theories when applying the tunneling formulism without considering quantum gravity effects. In this Letter, we recalculate the emission probability by taking into account of the log-area correction to the Bekenstein-Hawking entropy and the statistical correlation between quanta emitted. The crucial role of the black hole remnant on the entropy conservation is highlighted. We model the remnant as a higher dimensional linear dilaton vacuum in order to show that such a remnant model cannot radiate and its temperature would be zero. In addition to this, the entropy conservation in the higher dimensional linear dilaton black holes is also discussed. In summary, we show in detail that the information can also leak out from the linear dilaton black holes together with preserving unitarity in quantum mechanics.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10773-011-0824-9) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.International Journal of Theoretical Physics, Springer2016-01-13T12:54:47Z2016-01-13T12:54:47Z2011Article“Entropy Conservation of Linear Dilaton Black Holes in Quantum Corrected Hawking Radiation”, Izzet Sakalli, Mustafa Halilsoy, and Hale Pasaoglu, Int. J. Theo. Phys. 50, 3212 (2011).1572-9575 (online)0020-7748 (print)DOI: 10.1007/s10773-011-0824-9http://dx.doi.org/10.1007/s10773-011-0824-9http://hdl.handle.net/11129/1969en_US;International Journal of Theoretical Physics 50 (10): 3212-3224, 2011
oai:i-rep.emu.edu.tr:11129/19702016-01-14T00:00:26Zhdl_11129_787Hawking Radiation of Linear Dilaton Black Holes in Various TheoriesPaşaoğlu, HaleSakallı, İzzetgeneral relativityblack holeshawking radiationquantum tunnelingEntropyLinear dilaton black holesTunneling effectThin film brick-wall modelUsing the Damour-Ruffini-Sannan, the Parikh-Wilczek and the thin film brick-wall models, we investigate the Hawking radiation of uncharged massive particles from 4-dimensional linear dilaton black holes, which are the solutions to Einstein-Maxwell-Dilaton, Einstein-Yang-Mills-Dilaton and Einstein-Yang-Mills-Born-Infeld-Dilaton theories. Our results show that the tunneling rate is related to the change of Bekenstein-Hawking entropy. Contrary to the many studies in the literature, here the emission spectrum is precisely thermal. This implies that the derived emission spectrum is not consistent with the unitarity of the quantum theory, which would possibly lead to the information loss.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1007/s10773-009-0156-1) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.International Journal of Theoretical Physics, Springer2016-01-13T13:06:13Z2016-01-13T13:06:13Z2009Article“Hawking Radiation of Linear Dilaton Black Holes in Various Theories”, Hale Pasaoglu and Izzet Sakalli, Int. J. Theo. Phys. 48, 3517 (2009).1572-9575 (online)0020-7748 (print)DOI: 10.1007/s10773-009-0156-1http://dx.doi.org/10.1007/s10773-009-0156-1http://hdl.handle.net/11129/1970en_US;Int.J.Theor.Phys.48:3517-3525,2009
oai:i-rep.emu.edu.tr:11129/19722016-01-14T00:00:25Zhdl_11129_787Dilatonic interpolation between Reissner-Nordstrom and Bertotti-Robinson spacetimes with physical consequencesMazharimousavi, S. HabibHalilsoy, MustafaSakallı, İzzetGürtuğ, Özaygeneral relativityblack holesWe give a general class of static, spherically symmetric, non-asymptotically flat and asymptotically non-(anti) de Sitter black hole solutions in Einstein-Maxwell-Dilaton (EMD) theory of gravity in 4-dimensions. In this general study we couple a magnetic Maxwell field with a general dilaton potential, while double Liouville-type potentials are coupled with the gravity. We show that the dilatonic parameters play the key role in switching between the Bertotti-Robinson and Reissner-Nordstr\"om spacetimes. We study the stability of such black holes under a linear radial perturbation, and in this sense we find exceptional cases that the EMD black holes are unstable. In continuation we give a detailed study of the spin-weighted harmonics in dilatonic Hawking radiation spectrum and compare our results with the previously known ones. Finally, we investigate the status of resulting naked singularities of our general solution when probed with quantum test particles.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1088/0264-9381/27/10/105005) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Classical and Quantum Gravity, Institute of Physics (IOP) Publishing2016-01-13T13:46:16Z2016-01-13T13:46:16Z2010Article“Dilatonic Interpolation Between Reissner-Nordström and Bertotti-Robinson Spacetimes with Physical Consequences”, S.H. Mazharimousavi, Mustafa Halilsoy, Izzet Sakalli, and Ozay Gurtug, Class. Quantum Grav., 27, 105005 (2010).0264-9381DOI: 10.1088/0264-9381/27/10/105005http://dx.doi.org/10.1088/0264-9381/27/10/105005http://hdl.handle.net/11129/1972en_USIOP SCIENCE;Class.Quant.Grav.27:105005,2010
oai:i-rep.emu.edu.tr:11129/19732016-01-15T00:00:21Zhdl_11129_787Effect of the Born-Infeld Parameter in higher dimensional Hawking radiationMazharimousavi, S. HabibSakallı, İzzetHalilsoy, Mustafageneral relativityblack holeshawking radiationquantum tunnelingRadiationGeneral Relativity and Quantum CosmologyWe show in detail that the Hawking temperature calculated from the surface gravity is in agreement with the result of exact semi-classical radiation spectrum for higher dimensional linear dilaton black holes in various theories. We extend the method derived first by Cl\'ement-Fabris-Marques for 4-dimensional linear dilaton black hole solutions to the higher dimensions in theories such as Einstein-Maxwell-Dilaton, Einstein-Yang-Mills-Dilaton and Einstein-Yang-Mills-Born-Infeld-Dilaton. Similar to the Cl\'ement-Fabris-Marques results, it is proved that whenever an analytic solution is available to the massless scalar wave equation in the background of higher dimensional massive linear dilaton black holes, an exact computation of the radiation spectrum leads to the Hawking temperature T_{H} in the high frequency regime. The significance of the dimensionality on the value of T_{H} is shown, explicitly. For a chosen dimension, we demonstrate how higher dimensional linear dilaton black holes interpolate between the black hole solutions with Yang-Mills and electromagnetic fields by altering the Born-Infeld parameter in aspect of measurable quantity T_{H}. Finally, we explain the reason of, why massless higher dimensional linear dilaton black holes cannot radiate.The file in this item is the publisher version (published version) of the article.Physics Letters B, Elsevier2016-01-14T07:27:06Z2016-01-14T07:27:06Z2009Article“Effect of the Born-Infeld Parameter in Higher Dimensional Hawking Radiation” , S. Habib Mazharimousavi, Izzet Sakalli, and Mustafa Halilsoy, Phys. Lett. B 672, 177 (2009).0370-2693DOI : 10.1016/j.physletb.2009.01.024http://hdl.handle.net/11129/1973en_USElsevier;Phys.Lett.B672:177-181,2009
oai:i-rep.emu.edu.tr:11129/19742016-01-15T00:00:25Zhdl_11129_787Exact solutions to a massive charged scalar field equation in the magnetically charged stringy black hole geometry and Hawking radiationSakallı, İzzetAl-Badawi, Ahmadgeneral relativityblack holeshawking radiationExact solutions of a massive complex scalar field equation in the geometry of a Garfinkle-Horowitz-Strominger (stringy) black hole with magnetic charge is explored. The separated radial and angular parts of the wave equation are solved exactly in the non-extreme case. The angular part is shown to be an ordinary spin-weighted spheroidal harmonics with a spin-weight depending on the magnetic charge. The radial part is achieved to reduce a confluent Heun equation with a multiplier. Finally, based on the solutions, it is shown that Hawking temperature of the magnetically charged stringy black hole has the same value as that of the Schwarzschild black hole.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1139/P09-024) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Canadian Journal of Physics, NRC Research Press2016-01-14T07:44:52Z2016-01-14T07:44:52Z2009Article“Exact Solutions to a Massive Charged Scalar Field Equation in the Magnetically Charged Stringy Black-Hole Geometry and Hawking Radiation”, Izzet Sakalli and A. Al-Badawi, Can. J. Phys. 87, 349 (2009).0008-4204DOI: 10.1139/P09-024http://dx.doi.org/10.1139/P09-024http://hdl.handle.net/11129/1974en_US;Canadian Journal of Physics 87 (4), 349-352 (2009)
oai:i-rep.emu.edu.tr:11129/19752016-01-15T00:00:25Zhdl_11129_787Solution of the Dirac equation in the rotating Bertotti-Robinson spacetimeAl-Badawi, AhmadSakallı, İzzetgeneral relativityrotating Bertotti-Robinson spacetimeDirac equationGeneral Relativity and Quantum CosmologyThe Dirac equation is solved in the rotating Bertotti-Robinson spacetime. The set of equations representing the Dirac equation in the Newman-Penrose formalism is decoupled into an axial and angular part. The axial equation, which is independent of mass, is solved exactly in terms of hypergeometric functions. The angular equation is considered both for massless (neutrino) and massive spin-(1/2) particles. For the neutrinos, it is shown that the angular equation admits an exact solution in terms of the confluent Heun equation. In the existence of mass, the angular equation does not allow an analytical solution, however, it is expressible as a set of first order differential equations apt for numerical study.The file in this item is the publisher version (published version) of the article.Journal of Mathematical Physics, American Institute of Physics (AIP)2016-01-14T08:08:26Z2016-01-14T08:08:26Z2008Article“Solution of the Dirac Equation in the Rotating Bertotti-Robinson Spacetime", Ahmad Al-Badawi and Izzet Sakalli, J. Math. Phys. 49, 052501 (2008).0022-2488DOI: 10.1063/1.2912725http://hdl.handle.net/11129/1975en_US;J.Math.Phys.49:052501,2008
oai:i-rep.emu.edu.tr:11129/19762016-01-15T00:00:26Zhdl_11129_787Chaos in Kundt type III SpacetimesSakallı, İzzetHalilsoy, Mustafageneral relativitychaosKundt type III SpacetimesGeneral Relativity and Quantum CosmologyWe consider geodesics motion in a particular Kundt type III spacetime in which Einstein-Yang-Mills equations admit solutions. On a particular surface as constraint we project the geodesics into the (x,y) plane and treat the problem as a 2-dimensional one. Our numerical study shows that chaotic behavior emerges under reasonable conditions.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1088/0256-307X/28/7/070402) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Chinese Physics Letters, Institute of Physics (IOP) Publishing2016-01-14T11:58:04Z2016-01-14T11:58:04Z2011Article“Chaos in Kundt Type-III Spacetimes”, Izzet Sakalli and Mustafa Halilsoy, Chin. Phys. Lett. 28, 070402 (2011).0256-307XDOI: 10.1088/0256-307X/28/7/070402http://dx.doi.org/10.1088/0256-307X/28/7/070402http://hdl.handle.net/11129/1976en_US;Chin.Phys.Lett.28:070402,2011
oai:i-rep.emu.edu.tr:11129/19772016-01-15T00:00:26Zhdl_11129_787Chaos in electrovac and non-Abelian plane wave spacetimesSakallı, İzzetHalilsoy, MustafaChaosnon-Abelian plane wave spacetimesgeneral relativitySuperposed electrovac pp-waves causes chaos. To show this, we project the particle geodesics onto the (x,y) plane and simulate the phase space’s Poincaré section numerically. Similar considerations apply, with minor modifications, to the geodesics in a non-Abelian plane wave spacetime.The file in this item is the publisher version (published version) of the article.Physical Review D, American Physical Society (APS)2016-01-14T12:04:18Z2016-01-14T12:04:18Z2006Article"Chaos in Electrovac and Non-Abelian Plane Wave Spacetimes”, Izzet Sakalli and Mustafa Halilsoy, Phys. Rev. D 74, 067501 (2006).1550-7998DOI: 10.1103/PhysRevD.74.067501http://hdl.handle.net/11129/1977en_US;Phys. Rev. D 74, 067501 (2006)
oai:i-rep.emu.edu.tr:11129/19782016-01-15T00:00:26Zhdl_11129_787Solution of Dirac equation in the near horizon geometry of an extreme Kerr black holeSakalli, IzzetHalilsoy, Mustafageneral relativityblack holesGeneral Relativity and Quantum CosmologyDirac equation is solved in the near horizon limit geometry of an extreme Kerr black hole. We decouple equations first as usual, into an axial and angular part. The axial equation turns out to be independent of the mass and is solved exactly. The angular equation reduces, in the massless case, to a confluent Heun equation. In general for nonzero mass, the angular equation is expressible at best, as a set of coupled first order differential equations apt for numerical investigation. The axial potentials corresponding to the associated Schrodinger-type equations and their conserved currents are found. Finally, based on our solution, we verify in a similar way the absence of superradiance for Dirac particles in the near horizon, a result which is well-known within the context of general Kerr background.The file in this item is the publisher version (published version) of the article.Physical Review -Series d-, American Physical Society (APS)2016-01-14T12:15:06Z2016-01-14T12:15:06Z2004Article"Solution of the Dirac Equation in the Near Horizon Geometry of an Extreme Kerr Black Hole", I. Sakalli and M. Halilsoy, Phys. Rev. D 69, 124012 (2004) (e-print arXiv: gr-qc/0556-2821DOI: 10.1103/PhysRevD.69.124012http://hdl.handle.net/11129/1978en_US;Phys.Rev. D69 (2004) 124012
oai:i-rep.emu.edu.tr:11129/21282016-02-18T08:54:30Zhdl_11129_787New Singular and Nonsingular Colliding Wave Solutions in Einstein - Maxwell - Scalar TheoryGürtuğ, ÖzayHalilsoy, MustafaSakallı, İzzetgeneral relativityColliding Wave SolutionA technique is given to generate coupled scalar field solutions in colliding Einstein - Maxwell (EM) waves. By employing the Bell - Szekeres solution as seed and depending on the chosen scalar field it is possible to construct nonsingular solutions. If the original EM solution is already singular addition of scalar fields does not make the physics any better. In particular, scalar field solution that is transformable to spherical symmetry is plagued with singularities.Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1023/A:1027349606694) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.General Relativity and Gravitation2016-02-18T08:53:38Z2016-02-18T08:53:38Z2003ArticleO.Gurtug, M.Halilsoy and I.Sakalli, Gen. Relativ. Grav. 35, 2159 (2003). “New Singular and Nonsingular Colliding Wave Solutions in EMS Theory”1572-9532 (online)0001-7701 (print)DOI: 10.1023/A:1027349606694http://dx.doi.org/10.1023/A:1027349606694http://hdl.handle.net/11129/2128en_US;Gen.Rel.Grav. 35 (2003) 2159-2170info:eu-repo/semantics/closedAccess
oai:i-rep.emu.edu.tr:11129/21292016-02-19T00:00:30Zhdl_11129_787Collision of Electromagnetic Shock Waves Coupled with Axion Waves: An ExampleHalilsoy, MustafaSakallı, İzzetgeneral relativityCollision of Electromagnetic Shock WaveWe present an exact solution that describes collision of electromagnetic shock waves coupled with axion plane waves. The axion has a rather special coupling to the cross polarization term of the metric. The initial data on the null surfaces is well-defined and collision results in a singularity free interaction region. Our solution is a generalization of the Bell-Szekeres solution in the presence of an axion field.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1088/0264-9381/20/8/301) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.Classical and Quantum Gravity, Institute of Physics (IOP) Publishing2016-02-18T09:17:29Z2016-02-18T09:17:29Z2003ArticleMustafa Halilsoy and Izzet Sakalli, Class. Quantum. Grav. 20, 1417 (2003). “Collision of EM Shock Waves Coupled With Axion Waves: An example”1361-6382 (online)0264-9381 (print)DOI: 10.1088/0264-9381/20/8/301http://dx.doi.org/10.1088/0264-9381/20/8/301http://hdl.handle.net/11129/2129en_US;Class.Quant.Grav. 20 (2003) 1417-1422info:eu-repo/semantics/closedAccess
oai:i-rep.emu.edu.tr:11129/21302016-02-19T00:00:31Zhdl_11129_787Cosmic Strings Coupled With a Massless Scalar FieldGürtuğ, ÖzaySakallı, İzzetgeneral relativityCosmic Strings CoupledA scalar field generalization of Xanthopoulos's cylindrically symmetric solutions of the vacuum Einstein equation is obtained. The obtained solution preserves the properties of the Xanthopoulos solution, which are regular on the axis, asymptotically flat and free from the curvature singularities. The solution describes stable, infinite length of rotating cosmic string interacting with gravitational and scalar waves.The file in this item is the post-print version of the article (author’s copy; author’s final manuscript, accepted for publication after peer-review process). Due to copyright restrictions, the access to the publisher version (published version) of this article is only available via subscription. You may click URI (with DOI: 10.1023/A:1026199809109) and have access to the Publisher Version of this article through the publisher web site or online databases, if your Library or institution has subscription to the related journal or publication.International Journal of Theoretical Physics, Springer2016-02-18T10:44:16Z2016-02-18T10:44:16Z2003ArticleOzay Gurtug and Izzet Sakalli, “ Cosmic Strings Coupled With a Massless Scalar Field”, International Journal of Theoretical Physics, Vol. 42, No: 8, pp:1863 – 1876, (2003).1572-9575 (online)0020-7748 (print)DOI: 10.1023/A:1026199809109http://dx.doi.org/10.1023/A:1026199809109http://hdl.handle.net/11129/2130en_US;Int.J.Theor.Phys. 42 (2003) 1875-1888info:eu-repo/semantics/openAccess
oai:i-rep.emu.edu.tr:11129/19332016-01-08T00:00:26Zhdl_11129_481Particle Collision near 1+1-D Horava-Lifshitz Black HolesHalilsoy, MustafaÖvgün, Aligeneral relativityHorava-Lifshitz Black Holesparticle collisionbsw effect2016-01-07T12:02:02Z2016-01-07T12:02:02Z2016-01-07Presentationhttp://hdl.handle.net/11129/1933en_USQDIS14 Famagusta, Northern Cyprus 2 May 2015;arXiv:1504.03840 [gr-qc]
oai:i-rep.emu.edu.tr:11129/19442016-01-09T00:00:25Zhdl_11129_481Dark Matter; Modification of F(R) or Wimps MiracleÖvgün, AliDark MatterModification of F(R)general relativityWimps MiraclegravityMaster’s Thesis Defense Presentation.2016-01-08T12:53:26Z2016-01-08T12:53:26Z2016-01-08Articlehttp://hdl.handle.net/11129/1944en_USMaster’s Thesis Defense Presentation;
oai:i-rep.emu.edu.tr:11129/19342016-01-08T00:00:26Zhdl_11129_481Thin-shell wormholes from the regular Hayward black holeÖvgün, Aligeneral relativityThin-shell wormholesHayward black holewormhole2016-01-07T12:03:12Z2016-01-07T12:03:12Z2016-01-07Presentationhttp://hdl.handle.net/11129/1934en_US;arXiv:1312.6665
oai:i-rep.emu.edu.tr:11129/19392016-01-08T00:00:27Zhdl_11129_481Kütlenin GizemiÖvgün, AliKütleHiggs BozonCernLHC DeneyiStandart Modelparçacık fiziğiMassHiggs2016-01-07T14:05:41Z2016-01-07T14:05:41Z2016-01-07Presentationhttp://hdl.handle.net/11129/1939other;2007 UFOK-ESKISEHIR
oai:i-rep.emu.edu.tr:11129/19432016-01-08T00:00:30Zhdl_11129_481The Dark MatterÖvgün, AliWimpsDark MatterCosmologygeneral relativity2016-01-07T14:29:10Z2016-01-07T14:29:10Z2016-01-07Presentationhttp://hdl.handle.net/11129/1943en
oai:i-rep.emu.edu.tr:11129/19712016-01-14T00:00:26Zhdl_11129_125Compton ScatteringÖvgün, Aliparticle physcicscompton scatteringquantum field theoryUniversity of Southampton2016-01-13T13:25:53Z2016-01-13T13:25:53Z2011ThesisOvgun, Ali. (2011). Compton Scattering. Thesis (Ph.D.), Southampton University, Faculty of Physical and Applied Sciences, School of Physics and Astronomy, Southampton: England.http://hdl.handle.net/11129/1971enThis is my calculations of Christmas problem which is Compton scattering in Southampton Uni. (2011).;
oai:i-rep.emu.edu.tr:11129/19412016-01-08T00:00:29Zhdl_11129_48121. yy Fiziği Sicim Teorisi; ve Maddenin GizemiÖvgün, AliSicim TeorisiString TheoryKütlenin GizemiHiggs BosonLisans 3.sınıfta ODTU de düzenlenen Ulusal Fizik Öğrencileri konferansında yaptıgım sunumun özeti.2016-01-07T14:09:32Z2016-01-07T14:09:32Z2016-01-07Presentationhttp://hdl.handle.net/11129/1941other
oai:i-rep.emu.edu.tr:11129/19402016-01-08T00:00:29Zhdl_11129_481Dark side of the cosmosÖvgün, AlicosmologyuniverseWhen I was 3rd year undergraduate student at IYTE.,I gave a seminer to students of physics society which I was the head of this society for 3 years in IYTE.2016-01-07T14:07:46Z2016-01-07T14:07:46Z2016-01-07Presentationhttp://hdl.handle.net/11129/1940en_US
0001-01-01T00:00:00Z/9999-12-31T23:59:59Z/hdl_11129_124/oai_dc/100