Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Vertogradov, Vitalii"'
Autor:
Vertogradov, Vitalii, Övgün, Ali
A real astrophysical black hole, surrounded by an accretion disc, experiences time-dependent mass variation due to accretion, impacting observable features like the shadow. In this work, we analyzed the dynamical shadow by extending the concept of th
Externí odkaz:
http://arxiv.org/abs/2412.10930
Autor:
Vertogradov, Vitalii
Dynamical black holes have an apparent horizon as one of their characteristics. The later might be null, time-like, or space-like surfaces that define the evolution of a black hole. Our study examines how an apparent horizon's behavior is influenced
Externí odkaz:
http://arxiv.org/abs/2410.10582
Autor:
Vertogradov, Vitalii, Shleiger, Leonid
In this work, we explore the properties of timelike geodesic for particles with zero energy. We found some similarities between geodesic motion in Schwarzschild black hole and timelike geodesics for particles with zero energy. We show, that general r
Externí odkaz:
http://arxiv.org/abs/2410.05198
Autor:
Vertogradov, Vitalii, Övgün, Ali
In this paper, we present three exact solutions to the Einstein field equations, each illustrating different black hole models. The first solution introduces a black hole with a variable equation of state, $P = k(r)\rho$, which can represent both sin
Externí odkaz:
http://arxiv.org/abs/2408.02699
Gravitational decoupling allows to obtain new solutions of general relativity. In this paper, we obtain new solutions of the Einstein field equations which describe non-singular black holes. We consider Hayward and Bardeen regular black holes as seed
Externí odkaz:
http://arxiv.org/abs/2405.05370
Publikováno v:
Int.J.Geom.Meth.Mod.Phys. 2 (2025) 2540001
Black hole shadows and photon spheres offer valuable tools for investigating black hole properties. Recent observations by the Event Horizon Telescope Collaboration have confirmed the existence of rotating black holes. Black hole parameters influence
Externí odkaz:
http://arxiv.org/abs/2405.05077
Autor:
Vertogradov, Vitalii, Övgün, Ali
Publikováno v:
Physics Letters B 854, 138758 (2024)
Recent observations of black hole shadows have revolutionized our ability to probe gravity in extreme environments. This manuscript presents a novel analytic method to calculate, in leading-order terms, the key parameters of photon sphere and shadow
Externí odkaz:
http://arxiv.org/abs/2404.18536
Autor:
Vertogradov, Vitalii, Övgün, Ali
Publikováno v:
Phys.Dark Univ. 45, 101541 (2024)
In this paper, we introduce a new approach to study the behavior of the photon sphere and shadow radius. Our method uses extended gravitational decoupling and reveals two important analytic results. First, the additional matter field alters the photo
Externí odkaz:
http://arxiv.org/abs/2404.04046
In this paper, we investigate the influence of primary hair ($l$) on the shadows of hairy Schwarzschild and Reissner-Nordstr\"om black holes obtained through gravitational decoupling. In the context of hairy Schwarzschild black holes, $l$ either has
Externí odkaz:
http://arxiv.org/abs/2403.16743
Autor:
Vertogradov, Vitalii
The process of the gravitational collapse might lead not only to a black hole but also to naked singularity formation. In this paper, we consider the generalized Vaidya spacetime with polytropic and generalized polytropic equations of state. We solve
Externí odkaz:
http://arxiv.org/abs/2311.15671