26 citations · 74 across the 19 of their papers we have counts for
19 papers
Global structure of Kerr-Newman-BR spacetime
Hryhorii Ovcharenko
We conduct an investigation of the global structure of Kerr-Newman-BR spacetime and its various subcases such as Schwarzschild-BR spacetime. In this work, we extend the result of o…
Thermodynamics of Genuine Kerr-Bertotti-Robinson Black Holes
David Kubiznak, Hryhorii Ovcharenko, Jiri Podolsky
We propose a thermodynamic description of the genuine Kerr-Bertotti-Robinson (Kerr-BR) black hole spacetimes. Contrary to previous studies, such solutions no longer have electric c…
Kerr-Newman and genuine Kerr black holes in the Bertotti-Robinson magnetic field
Hryhorii Ovcharenko, Jiri Podolsky
We present a spacetime that describes a rotating and charged black hole immersed in an external magnetic field. This exact solution to the Einstein-Maxwell equations has a surprisi…
Comment on the "New Rotating Black Hole in Electromagnetic Fields: Cosmological Horizon without Cosmological Constant''
Hryhorii Ovcharenko
In this comment we discuss some properties of the novel spacetime, recently found in [L. Ma, H. Lü, arXiv:2606.23782]. In particular, we draw attention to the background of this so…
Uniqueness of stationary axisymmetric type D black holes with non-aligned electromagnetic field
Hryhorii Ovcharenko, Jiri Podolsky
We demonstrate the uniqueness of the spacetimes recently found by us in [H. Ovcharenko and J. Podolsky, Phys. Rev. D 112 (2025) 064076]. First, we prove that the conformal-to-Carte…
Circular orbits in spherically symmetric spacetimes and BSW effect with nonzero force
Hryhorii Ovcharenko, O. B. Zaslavskii
We consider circular particle motion under the action of an unspecified force in a static spherically symmetric spacetime. We derive the machinery that allows one to find the force…
Static black holes in an external uniform electromagnetic field: Reissner-Nordstrom accelerating in Bertotti-Robinson
Hryhorii Ovcharenko, Jiri Podolsky
We provide a detailed analysis of the non-twisting subcase of the large class of type D black holes with a non-aligned electromagnetic field, presented recently in [H. Ovcharenko a…
Exact Kerr-Newman-(A)dS and other spacetimes in bumblebee gravity: employing a simple generating technique
Hryhorii Ovcharenko
In this work, we show that if the bumblebee field in the Einstein-bumblebee theory is given by its vacuum expectation value () and it is not dynamical ($\partial_μB_ν-\par…
Hidden symmetries and separability structures of Ovcharenko-Podolský and conformal-to-Carter spacetimes
Finnian Gray, David Kubiznak, Hryhorii Ovcharenko +1
Recently, a remarkable new class of spacetimes describing black holes immersed in a non-aligned electromagnetic field has been found. While still of type D, this class goes beyond…
A novel class of rotating black holes with non-aligned electromagnetic field
Hryhorii Ovcharenko, Jiri Podolsky
We present a new class of expanding and twisting solutions to the Einstein-Maxwell equations of algebraic type D, where the null eigendirections of the Faraday tensor are not align…
New class of rotating charged black holes with nonaligned electromagnetic field
Hryhorii Ovcharenko, Jiří Podolský
We present a large family of twisting and expanding solutions to the Einstein-Maxwell equations of algebraic type D, for which the two double principal null directions (PNDs) of th…
Kerr black hole in a uniform Bertotti-Robinson magnetic field: An exact solution
Jiri Podolsky, Hryhorii Ovcharenko
A new class of exact spacetimes in Einstein's gravity, which are Kerr black holes immersed in an external magnetic (or electric) field that is asymptotically uniform and oriented a…
Near-horizon behavior of nonequatorial accelerated particle motion and high energy particle collisions
H. V. Ovcharenko, O. B. Zaslavskii
We consider motion of a particle in the background of a stationary axially symmetric generic black hole. A particle experiences the action of a force of unspecified nature. We requ…
Naked and truly naked rotating black holes
H. V. Ovcharenko, O. B. Zaslavskii
Previously, it was noticed that in some space-times with Killing horizons some curvature components, responsible for tidal forces, small or even zero in the static frame, become en…
Revisiting black holes of algebraic type D with a cosmological constant
Hryhorii Ovcharenko, Jiri Podolsky, Marco Astorino
As an extension of our previous work [1] (arXiv:2409.02308), we study a complete family of type D black holes with Kerr-like rotation, NUT twist, acceleration, electric and magneti…
Black holes of type D revisited: relating their various metric forms
Hryhorii Ovcharenko, Jiri Podolsky, Marco Astorino
We investigate a complete family of spacetimes which represent black holes with rotation, NUT twist, acceleration, electric and magnetic charges. These are exact solutions of the E…
High energy head-on particle collisions near event horizons: classifcation of scenarios
H. V. Ovcharenko, O. B. Zaslavskii
We consider head-on collisions of two particles near the event horizon. Particle 1 is outgoing, particle 2 is ingoing. We elucidate, in which case the energy in the cent…
Dynamics of redshift/blueshift during free fall under the Schwarzschild horizon
H. V. Ovcharenko, O. B. Zaslavskii
We consider a free-falling observer who crosses the event horizon in the Schwarzschild background. In the course of this fall, he/she can receive signals from an object (like a sta…
Axially symmetric rotating black hole with regular horizons
H. V. Ovcharenko, O. B. Zaslavskii
We consider the metric of an axially symmetric rotating black hole. We do not specify the concrete form of a metric and rely on its behavior near the horizon only. Typically, it is…