Browsing Department of Physics by Author "Gürtuğ, Özay"

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Browsing Department of Physics by Author "Gürtuğ, Özay"

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  • 2+1-dimensional electrically charged black holes in Einstein - Power Maxwell Theory 
    Gürtuğ, Özay; Mazharimousavi, S. Habib; Halilsoy, Mustafa (Physical Review D, American Physical Society (APS), 2012)
    A large family of new black hole solutions in 2+1-dimensional Einstein-Power-Maxwell (EPM) gravity with prescribed physical properties is derived. We show with particular examples that according to the power parameter k ...
  • 2+1 dimensional magnetically charged solutions in Einstein - Power - Maxwell theory 
    Mazharimousavi, S. Habib; Gürtuğ, Özay; Halilsoy, Mustafa; Ünver, Özlem (Physical Review D, Springer, 2011)
    We 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 ...
  • Colliding Wave Solutions in a Symmetric Non-metric Theory 
    Gürtuğ, Özay; Halilsoy, Mustafa (International Journal of Theoretical Physics, Springer, 2009)
    A method is given to generate the non-linear interaction (collision) of linearly polarized gravity coupled torsion waves in a non-metric theory. Explicit examples are given in which strong mutual focussing of gravitational ...
  • Cosmic Strings Coupled With a Massless Scalar Field 
    Gürtuğ, Özay; Sakallı, İzzet (International Journal of Theoretical Physics, Springer, 2003)
    A 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 ...
  • Dilatonic interpolation between Reissner-Nordstrom and Bertotti-Robinson spacetimes with physical consequences 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa; Sakallı, İzzet; Gürtuğ, Özay (Classical and Quantum Gravity, Institute of Physics (IOP) Publishing, 2010)
    We 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 ...
  • Effect of Extremely Low Frequency Magnetic Field on the Growth Rate of Bacteria 
    Hassan, Akhink Akram (Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ), 2015-08)
    Developments in technology has resulted an increase in the use of electrical appliances. Electrical appliances use an alternating current with a frequency of 50 Hz. This alternating current generates an electromagnetic ...
  • Effect of NUT parameter on the analytic extension of the Cauchy horizon that develop in colliding wave spacetimes 
    Gürtuğ, Özay; Halilsoy, Mustafa (International Journal of Modern Physics A, World Scientific Publishing, 2009)
    The Cauchy horizon forming colliding wave solution due to Chandrasekhar and Xanthopoulos (CX) has been generalized by inclusion of the NUT (Newman - Unti - Tamburino) parameter. This is done by transforming the part of the ...
  • The Effect of Sources on the Inner Horizon of Black Holes 
    Gürtuğ, Özay; Halilsoy, Mustafa (Physical Review D, American Physical Society (APS), 2001)
    A single pulse of null dust and colliding null dust both transform a regular horizon into a spacelike singularity in the space of colliding waves. The local isometry between such space-times and black holes extrapolates ...
  • Emergent cosmological constant from colliding electromagnetic waves 
    Halilsoy, Mustafa; Mazharimousavi, S. Habib; Gürtuğ, Özay (Journal of Cosmology and Astroparticle Physics, Institute of Physics Publishing (IOP), 2014)
    In 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 ...
  • Generating Static Spherically Symmetric Black-holes in Lovelock Gravity 
    Mazharimousavi, S. Habib; Gürtuğ, Özay; Halilsoy, Mustafa (International Journal of Modern Physics D, World Scientific Publishing, 2009)
    Generalization of a known theorem to generate static, spherically symmetric black-hole solutions in higher dimensional Lovelock gravity is presented. Particular limits, such as Gauss-Bonnet (GB) and/or Einstein-Hilbert ...
  • Modified Rindler acceleration as a nonlinear electromagnetic effect 
    Halilsoy, Mustafa; Gürtuğ, Özay; Mazharimousavi, S. Habib (Astroparticle Physics, Elsevier, 2015)
    The 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 ...
  • A new Einstein-nonlinear electrodynamics solution in 2+1-dimensions 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa; Gürtuğ, Özay (European Physical Journal C: Particles and Fields, Springer, 2014)
    We 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 ...
  • New Singular and Nonsingular Colliding Wave Solutions in Einstein - Maxwell - Scalar Theory 
    Gürtuğ, Özay; Halilsoy, Mustafa; Sakallı, İzzet (General Relativity and Gravitation, 2003)
    A 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 ...
  • On Some Properties of the NUT-Curzon Space-Time 
    Halilsoy, Mustafa; Gürtuğ, Özay (Nuovo Cimento B, Springer, 1994)
    We present the NUT generalization of the Curzon metric with its multipole extension. The Schwarzschild quadrupole potential in the prolate spheroidal coordinates turns out to cancel the quadrupole moment of a ...
  • Quantum Probes of Timelike Naked Singularities in -Dimensional Power-Law Spacetimes 
    Gürtuğ, Özay; Mazharimousavi, S. Habib; Halilsoy, Mustafa (Advances in High Energy Physics, Hindawi Publishing Corporation, 2015)
    The 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, ...
  • Quantum probes of timelike naked singularities in the weak field regime of f(R) global monopole spacetime 
    Gürtuğ, Özay; Halilsoy, Mustafa; Mazharimousavi, S. Habib (Journal of High Energy Physics, Springer, 2014)
    The 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 ...
  • Quantum singularities in (2+1) dimensional matter coupled black hole spacetimes 
    Ünver, Özlem; Gürtuğ, Özay (Physical Review D, American Physical Society (APS), 2010)
    Quantum singularities considered in the 3D BTZ spacetime by Pitelli and Letelier (Phys. Rev. D77: 124030, 2008) is extended to charged BTZ and 3D Einstein-Maxwell-dilaton gravity spacetimes. The occurence of naked singularities ...
  • Quantum singularities in a model of f(R) Gravity 
    Tahamtan, Tayabeh; Gürtuğ, Özay (European Physical Journal C: Particles and Fields, Springer, 2012)
    The formation of a naked singularity in a model of f(R) gravity having as source a linear electromagnetic field is considered in view of quantum mechanics. Quantum test fields obeying the Klein-Gordon, Dirac and Maxwell ...
  • Reflection of electromagnetic waves from mixtures of plane gravitational and scalar waves 
    Gürtuğ, Özay; Halilsoy, Mustafa; Ünver, Özlem (Physical Review D,, 2006)
    We consider colliding wave packets consisting of hybrid mixtures of electromagnetic, gravitational and scalar waves. Irrespective of the scalar field, the electromagnetic wave still reflects from the gravitational wave. ...
  • Restricted Class of Colliding Einstein-Yang-Mills Plane Waves 
    Gürtuğ, Özay; Halilsoy, Mustafa (International Journal of Modern Physics A, World Scientific Publishing, 2009)
    By gauging an Abelian electromagnetic (em) solution through a non-Abelian transformation and in accordance with a theorem proved long time ago, we construct a simple class of colliding Einstein-Yang-Mills (EYM) plane waves. ...