13 papers
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…
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 s…
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…
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-…
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…
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…