Quasinormal modes of Kerr--Newman--de Sitter black hole: Linear stability and strong cosmic censorship conjecture

Abstract

We present an alternative formulation of coupled gravitational and electromagnetic perturbations of Kerr--Newman--de Sitter black holes, yielding decoupled radial and angular equations with a well-defined $\Lambda \to 0$ limit. We compute the quasinormal mode spectra using spectral and direct integration methods, finding excellent agreement. All of these modes are consistent with the linear stability of the Kerr--Newman--de Sitter black hole. We investigate the photon sphere and near-extremal modes, revealing a non-trivial interplay between rotation and electric charge. We further explore the implications for the strong cosmic censorship conjecture and find that the photon sphere modes predominantly determine its validity within the parameter space considered. While increasing the rotation of the black hole generally favours the strong cosmic censorship conjecture, increasing the electric charge can promote its violation. We also find that the region of parameter space exhibiting a violation of the conjecture is comparatively smaller for gravitational perturbations than for electromagnetic perturbations. These results highlight the important role of rotation, electric charge, and the nature of perturbations in determining the validity of the strong cosmic censorship conjecture in Kerr--Newman--de Sitter spacetimes.

arXiv comment34 pages, 5 tables, 10 figures. SS, SG, AC, CS, and SMD contributed equally to this work and should be considered joint first authors