Browsing by Author "Gürtuğ, Özay"
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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 ... 
Cosmic strings coupled with a massless scalar field
Gürtuğ, Özay; Sakallı, İzzet (Springerlink, 2003)A scalar field generalization of Xanthopoulos’s cylindrically symmetric solutions of the vacuum Einstein equations is obtained. The obtained solution preserves the properties of the Xanthopoulos solution, which are regular ... 
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 ... 
Effect of powerlaw Maxwell field to the gravitational lensing
Gürtuğ, Özay; Mangut, Mert (APS Physics, 19992019)In this paper, we extend the gravitational bending of light studies in Kottler metrics to comprise nonlinear electrodynamics within the framework of Einstein  power  Maxwell theory. We show that the closest approach ... 
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 a model of nonlinear electrodynamics: the case for electrically and magnetically charged compact objects
Gürtuğ, Özay; Mangut, Mert (Wiley Online Library, 2020)This paper aims to investigate the astrophysical applicability of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov (Ann. Phys. Berlin ... 
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 ... 
Helmholtz dalga denkleminin analizi: Maxwell denklemleri ve silindirik elektromanyetik dalgalar
Bacanak, İbrahim (Maltepe Üniversitesi, Fen Bilimleri Enstitüsü, 201808)Bu tezde, kısmi diferansiyel denklemlerin fizik ve mühendislik alanlarındaki uygulamaları kısaca ifade edilmiş olup bu uygulamalar arasından, Helmholtz denklemi detaylı bir şekilde araştırılarak kartezyen, silindirik ve ... 
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 ... 
Kuantum tekillik analizinin matematiksel temelleri: HoravaLifshitz teorisindeki uygulamaları
Mangut, Mert (Maltepe Üniversitesi, Fen Bilimleri Enstitüsü, 201807)Bu tezde, kuantum tekillik analizinin matematiksel dayanak noktaları ve bu analizin matematiği ele alınarak Horava – Lifshitz teorisindeki uygulaması yapılmıştır. İlk olarak, gerekli matematiksel altyapı ... 
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 probe of Hoˇravalifshitz gravity
Gürtuğ, Özay; Mangut, Mert (Cornell University, 2018)Particle probe analysis of the Kehagias  Sfetsos black hole spacetime of HoˇravaLifshitz gravity is extended to wave probe analysis within the framework of quantum mechanics. The timelike naked singularity that develops ... 
Quantum probe of timelike naked singularities for electrically and magnetically charged black holes in a model of nonlinear electrodynamics
Mangut, Mert; Gürtuğ, Özay (World Scientific Connecting Great Minds, 2020)The timelike naked singularities of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov is investigated within the framework of quantum ... 
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 ...