27 citations · 158 across the 22 of their papers we have counts for
9 papers · 1 filter
Analytical approach for calculating shadow of dynamical black hole
Vitalii Vertogradov, Ali Övgün
We develop a compact and transparent framework for photon dynamics and shadow formation in slowly evolving, spherically symmetric spacetimes. Starting from the Eddington-Finkelstei…
Signatures of a de Sitter-core black hole in ringing, transmission and optical appearance
N. Heidari, A. A. Araújo Filho, V. Vertogradov and +1
We investigate a static, asymptotically flat black hole whose central region approaches a de Sitter vacuum. The geometry is controlled by the ADM mass and a core scale , a…
Dynamical Black Holes: Apparent Horizon Versus Energy Conditions
Vitalii Vertogradov
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…
Exact Regular Black Hole Solutions with de Sitter Cores and Hagedorn Fluid
Vitalii Vertogradov, Ali Övgün
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 va…
General Approach on Shadow Radius and Photon Spheres in Asymptotically Flat Spacetimes and the Impact of Mass-Dependent Variations
Vitalii Vertogradov, Ali Övgün
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, i…
Analyzing the Influence of Geometrical Deformation on Photon Sphere and Shadow Radius: A New Analytical Approach -- Spherically Symmetric Spacetimes
Vitalii Vertogradov, Ali Övgün
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…
Non-singular black hole by gravitational decoupling and some thermodynamic properties
Maxim Misyura, Angel Rincon, Vitalii Vertogradov
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 bl…
Analyzing the Influence of Geometrical Deformation on Photon Sphere and Shadow Radius: A New Analytical Approach -Stationary, and Axisymmetric Spacetime
Vitalii Vertogradov, Ali Övgün, Reggie C. Pantig
Black hole shadows and photon spheres offer valuable tools for investigating black hole properties. Recent observations by the Event Horizon Telescope Collaboration have confirmed…
Influence of primary hair and plasma on intensity distribution of black hole shadows
Vitalii Vertogradov, Maxim Misyura, Parth Bambhaniya
In this paper, we investigate the influence of primary hair () on the shadows of hairy Schwarzschild and Reissner-Nordström black holes obtained through gravitational decoupling…