A standalone Lean 4 proof of the local equivalence between Kerr–Newman perturbation systems (1) and (7), for both spin signs, with reproducible source and an axiom audit.
In this paper we present the most recent observations of gravitational waves (GWs) by LIGO and Virgo detectors. We also discuss contributions of the recent Nobel prize winner, Sir Roger Penrose to understanding gravitational radiation and black holes …
Novel background metric expansion method for constructing rotating charged black hole solutions in higher-dimensional Kaluza-Klein supergravity with (anti-)de Sitter spacetime.