Browsing by Author "Halilsoy, Mustafa"
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2+1dimensional electrically charged black holes in Einstein  Power Maxwell Theory
Gürtuğ, Özay; Mazharimousavi, S. Habib; Halilsoy, Mustafa (APS Physics, 2010)A large family of new black hole solutions in 2 + 1 dimensional EinsteinpowerMaxwell gravity with prescribed physical properties is derived. We show with particular examples that according to the power parameter ... 
Colliding wave solutions in a symmetric nonmetric theory
Gürtuğ, Özay; Halilsoy, Mustafa (Springerlink, 2008)A method is given to generate the nonlinear interaction (collision) of linearly polarized gravity coupled torsion waves in a nonmetric theory. Explicit examples are given in which strong mutual focussing of gravitational ... 
Effect of NUT parameter on the analytic extension of the Cauchy horizon that develop in colliding wave spacetimes
Gürtuğ, Özay; Halilsoy, Mustafa (WorldScientific, 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 (APS Physics, 2001)Single pulse of null dust and colliding null dusts both transform a regular horizon into a spacelike singularity in the space of colliding waves. The local isometry between such spacetimes and black holes extrapolates ... 
Failure of a stability conjecture in general relativity
Gürtuğ, Özay; Halilsoy, Mustafa (Springerlink, 2002)By employing an exact backreaction geometry, HelliwellKonkowski stability conjecture is shown to fail. This happens when a test null dust is inserted to the interaction region of crosspolarized BellSzekeres spacetime. 
Generating static spherically symmetric blackholes in lovelock gravity
Mazharimousavi, S. Habib; Gürtuğ, Özay; Halilsoy, Mustafa (WorldScientific, 2009)Generalization of a known theorem to generate static, spherically symmetric blackhole solutions in higher dimensional Lovelock gravity is presented. Particular limits, such as GaussBonnet (GB) and/or EinsteinHilbert ... 
Gravitational lensing in rotating and twisting universes
Gürtuğ, Özay; Mangut, Mert; Halilsoy, Mustafa (Elsevier, 2021)Gravitational lensing caused by the gravitational field of massive objects has been studied and acknowledged for a long period of time. In this paper, however, we propose a different mechanism where the bending of light ... 
Horizon instability in the cross polarized Bell  Szekeres spacetime
Gürtuğ, Özay; Halilsoy, Mustafa (Cornell University, 2000)The quasiregular singularities (horizons) that form in the collision of cross polarized electromagnetic waves are, as in the linear polarized case, unstable. The validity of the HelliwellKonkowski stability conjecture ... 
A new Einsteinnonlinear electrodynamics solution in 2+1dimensions
Mazharimousavi, S. Habib; Halilsoy, Mustafa; Gürtuğ, Özay (Springerlink, 2013)We introduce a class of solutions in 2 + 1−dimensional EinsteinPowerMaxwell theory for circularly symmetric electric field. The electromagnetic field is considered with an angular component given by Fµν = E0δ t µδ θ ν ... 
New singular and nonsingular colliding wave solutions in EinsteinMaxwellScalar theory.
Gürtuğ, Özay; Halilsoy, Mustafa; Sakallı, İzzet (Springerlink, 2003)A technique is given to generate coupled scalar field solutions in colliding EinsteinMaxwell (EM) waves. By employing the Bell  Szekeres solution as seed and depending on the chosen scalar field, it is possible to ... 
Null singularities in colliding waves
Gürtuğ, Özay; Halilsoy, Mustafa (Cornell University, 2001)Colliding Einstein  Maxwell  Scalar fields need not necessarily doomed to become in a spacelike singularity. Examples are given in which null singularities emerge as intermediate stages between a spacelike singularity ... 
Null singularity formation by scalar fields in colliding waves and black holes
Gürtuğ, Özay; Halilsoy, Mustafa (Cornell University, 2002)It was believed that when gravitational, electromagnetic and scalar waves interact, a spacelike curvature singularity or Cauchy horizon develops because of mutual focusing. We show with an exact solution that the collision ... 
Quantum probes of timelike naked singularities in the weak eld regime of f(R) global monopole spacetime
Gürtuğ, Özay; Halilsoy, Mustafa; Mazharimousavi, S. Habib (Springerlink, 2014)The formation of a naked singularity in f(R) global monopole spacetime is considered in view of quantum mechanics. Quantum test elds obeying the KleinGordon, Dirac and Maxwell equations are used to probe the classical ... 
Reflection of electromagnetic waves from mixtures of plane gravitational and scalar waves
Gürtuğ, Özay; Halilsoy, Mustafa; Ünver, Özlem (APS Physics, 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 EinsteinYangMills plane waves
Gürtuğ, Özay; Halilsoy, Mustafa (WorldScientific, 2009)By gauging an Abelian electromagnetic (em) solution through a nonAbelian transformation and in accordance with a theorem proved long time ago, we construct a simple class of colliding EinsteinYangMills (EYM) plane ... 
Rindler modified schwarzschild geodesics
Halilsoy, Mustafa; Gürtuğ, Özay; Mazharimousavi, S. Habib (Springerlink, 2013)The mysterious attractive constant radial force acted in the past on Pioneer spacecrafts  the socalled Pioneer anomaly  is considered within the context of Rindler acceleration. As an idea this is tempting since it ... 
Search for gravitational waves through the electromagnetic faraday rotation
Halilsoy, Mustafa; Gürtuğ, Özay (APS Physics, 2007)A method is given which renders indirect detection of strong gravitational waves possible. This is based on the reflection (collision) of a linearly polarized electromagnetic shock wave from (with) a cross polarized ... 
Wavy way to the Kerr metric and the quantum nature of its ring singularity
Gürtuğ, Özay; Halilsoy, Mustafa (Cornell University, 2016)From inherent nonlinearity two gravitational waves, unless they are unidirectional, fail to satisfy a superposition law. They collide to develop a new spacetime carrying the imprints of the incoming waves. Same behaviour ...