Quasinormal modes of charged covariant effective black holes with a cosmological constant

Abstract

In this paper, we investigate the quasinormal modes of two covariant effective black holes characterized by the quantum parameter $\zeta$, charge $Q$, and cosmological constant $\Lambda$, under the scalar perturbation. By employing the pseudo-spectral method, we numerically calculate the quasinormal frequencies and analyze the influence of $\zeta$ on the spectra with respect to $Q$. Our results demonstrate that while the quantum parameter $\zeta$ significantly modifies the quasinormal frequency spectrum, the non-monotonic behavior and overtone outbursts persist. Notably, the impact of quantum gravity on the overtone outbursts is not merely limited to enhancement or suppression; instead, it introduces additional spectral features. Furthermore, a comprehensive analysis of the full quasinormal mode spectrum reveals rich interactions between complex and purely imaginary modes, including damping-rate crossings and merging-splitting behavior. These phenomena typically accompany overtone outbursts in near-extremal regimes, suggesting a potential connection between mode interactions and overtone outbursts. This work emphasizes the necessity of analyzing the full quasinormal frequency spectrum rather than focussing solely on fundamental modes, and provides novel insights into its underlying spectral structures.