14 papers
Optical-area minimum method for static spherical black hole shadows
Vitalii Vertogradov, Nikko John Leo S. Lobos, Ali Ovgun +1
We formulate a global optical-area method for shadows of static, spherically symmetric black holes. For the metric \(ds^{2}=-A(r)dt^{2}+B(r)dr^{2}+C(r)dΩ^{2}\), spherical sections…
Shadow of the generalized Vaidya black hole
Vitalii Vertogradov, Ali Ãvgün
In this paper, we investigate the shadow of the generalized Vaidya black hole described by the Husain solution. Assuming a barotropic equation of state for the additional matter se…
Regular Black Hole Formation and Gamma-Ray Burst from Matter Conversion
Vitalii Vertogradov, Zhanna Kuznetsova, Yu Shi
During the gravitational collapse of a massive star into a regular black hole, a new form of matter must be produced in order to prevent the formation of a central singularity. Sin…
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…
Can finite-density QCD matter support a regular black hole core?
G. Lambiase, A. Ovgun, A. Övgün +1
We investigate whether finite-density QCD matter can provide the stress-energy needed to regularize the center of a spherically symmetric black hole collapse. In a generalized Vaid…
Exact Dynamical Regular Black Holes from Generalized Polytropic Matter
Dmitriy Kudryavcev, Yi Ling, Vitalii Vertogradov
We present a class of exact, dynamical, and fully analytic solutions describing regular black holes formed via the gravitational collapse of matter obeying a generalized polytropic…