Extremal Charged Black Holes and Superradiantly Unstable Quasinormal Modes
High Energy Physics - Theory
2022-07-06 v2 General Relativity and Quantum Cosmology
Abstract
It was recently shown that the extremal charged black holes in STU supergravity suffer from superradiant instability owing to the existence of the unstable (low-frequency) quasibound states associated with a charged massive scalar field. In this paper, we show numerically that for some charge configurations, these black holes can also excite the (higher-frequency) superradiantly unstable quasinormal modes. We find empirically that the unstable modes are closely related to having a volcano-shaped effective potential in the Schr\"odinger-like wave equation.
Keywords
Cite
@article{arxiv.2201.11138,
title = {Extremal Charged Black Holes and Superradiantly Unstable Quasinormal Modes},
author = {Zhan-Feng Mai and Run-Qiu Yang and H. Lü},
journal= {arXiv preprint arXiv:2201.11138},
year = {2022}
}
Comments
17 pages, 11 graphs grouped into 5 figures, typos corrected, comments added and refences updated, to appear in EPJC