Browsing 08 Faculty of Arts and Sciences by Author "Halilsoy, Mustafa"

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Browsing 08 Faculty of Arts and Sciences by Author "Halilsoy, Mustafa"

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  • Collision of Electromagnetic Shock Waves Coupled with Axion Waves: An Example 
    Halilsoy, Mustafa; Sakallı, İzzet (Classical and Quantum Gravity, Institute of Physics (IOP) Publishing, 2003)
    We 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 ...
  • Comment on "Static and spherically symmetric black holes in f(R) theories" 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa (Physical Review D, American Physical Society (APS), 2012)
    We 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. ...
  • Constant curvature f(R) gravity minimally coupled with Yang-Mills field 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa; Tahamtan, Tayebeh (European Physical Journal C, Springer, 2011)
    We 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 ...
  • Counterrotational effects on stability of 2+1-dimensional thin-shell wormholes 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa (The European Physical Journal C, Springer, 2014)
    The 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 ...
  • Cross-Polarized Cylindrical Gravitational Waves of Einstein and Rosen 
    Halilsoy, Mustafa (Nuovo Cimento B, Springer, 1988)
    Using Einstein-Rosen's linearly polarized waves as the seed solution, we derive an interesting solution for the Einstein's equations that describes the evolution of such waves with the second polarization.
  • d-dimensional non-asymptotically flat thin-shell wormholes in Einstein-Yang-Mills-Dilaton gravity 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa; Amirabi, Zahra (Physics Letters A, Elsevier, 2011)
    Thin-shell wormholes in Einstein-Yang-Mills-dilaton (EYMD) gravity are considered. We show that a non-asymptotically flat (NAF) black hole solution of the d-dimensional EYMD theory provides stable thin-shell wormholes which ...
  • 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 ...
  • Distinct Family of Colliding Waves in General Relativity 
    Halilsoy, Mustafa (Physical Review D, American Physical Society (APS), 1988)
    We present a new family of exact solutions for the Einstein equations that describes colliding gravitational shock waves with cross polarization. In the limit of single polarization it reduces to a family that, up to a ...
  • Domain-Walls in Einstein-Gauss-Bonnet Bulk 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa (Physical Review D, American Physical Society (APS), 2010)
    We investigate the dynamics of a d-dimensional domain wall (DW) in a d+1-dimensional Einstein-Gauss-Bonnet (EGB) bulk. Exact effective potential induced by the Gauss-Bonnet (GB) term on the wall is derived. In the absence ...
  • Double-bounce domain-wall in Einstein-Yang-Mills-Scalar black holes 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa; Tahamtan, Tayabeh (European Physical Journal C, Springer, 2013)
    We 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 ...
  • 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 ...
  • Effect of sources on the inner horizon of black holes 
    Gürtuğ, Özay; Halilsoy, Mustafa (The American Physcial Society, 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 these ...
  • 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 ...
  • Effect of the Born-Infeld Parameter in higher dimensional Hawking radiation 
    Mazharimousavi, S. Habib; Sakallı, İzzet; Halilsoy, Mustafa (Physics Letters B, Elsevier, 2009)
    We 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 ...
  • Einstein-Born-Infeld black holes with a scalar hair in three-dimensions 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa (Modern Physics Letters A, World Scientific Publishing, 2015)
    We 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, ...
  • Einstein-Maxwell gravity coupled to a scalar field in 2+1-dimensions 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa (The European Physical Journal Plus, Springer, 2015)
    We 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, ...
  • Einstein-Yang-Mills black hole solution in higher dimensions by the Wu-Yang Ansatz 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa (Physics Letters, Elsevier, 2008)
    By employing the higher dimensional version of the Wu-Yang Ansatz we obtain black hole solutions in the spherically symmetric Einstein-Yang-Mills (EYM) theory. Although these solutions were found recently by other means, ...
  • 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 ...
  • Entropy Conservation of Linear Dilaton Black Holes in Quantum Corrected Hawking Radiation 
    Sakallı, İzzet; Paşaoğlu, Hale; Halilsoy, Mustafa (International Journal of Theoretical Physics, Springer, 2011)
    It 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 ...
  • Existence of Reissner-Nordstrom type black holes in f(R) gravity 
    Mazharimousavi, S. Habib; Halilsoy, Mustafa; Kerachian, Morteza (International Journal of Modern Physics D, World Scientific Publishing, 2013)
    We 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 ...