arxiv:2610.03701

Parity Isospectrality of the Kerr--Newman--de Sitter Black Hole

Published on Oct 2

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Abstract

Linear gravitoelectromagnetic perturbations of subextremal Kerr–Newman–de Sitter black holes exhibit parity isospectrality, with radiative perturbations reconstructed directly from gauge-invariant master variables in radiation gauge.

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Vacuum Kerr perturbations in general relativity have identical even- and odd-parity quasinormal frequencies. We establish this parity isospectrality for linear gravitoelectromagnetic perturbations of subextremal Kerr--Newman--de Sitter black holes, without a slow-rotation or small-charge expansion. We reconstruct the radiative metric and gauge-potential perturbations directly from gauge-invariant master variables in radiation gauge, without an intermediate complex potential.

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