期刊
EUROPEAN PHYSICAL JOURNAL C
卷 82, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-022-10490-y
关键词
-
资金
- National Natural Science Foundation of China (NSFC) [12005155, 11875200, 11935009]
This paper numerically demonstrates that the extremal charged black holes in STU supergravity can not only undergo low-frequency superradiant instability, but also excite higher-frequency superradiantly unstable quasinormal modes.
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 Schrodinger-like wave equation.
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