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Superradiance Instabilities of Charged Black Holes in Einstein-Maxwell-scalar Theory
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We study time evolutions of charged scalar perturbations on the background of a charged hairy black hole, in which the perturbations can be governed by a double-peak effective potential. By extracting quasinormal modes from the waveform of scalar perturbations, we discover that some quasinormal modes, which are trapped in a potential well between two potential peaks, can be superradiantly amplified. These superradiant modes make the hairy black hole unstable against charged scalar perturbations. Moreover, it is found that the superradiant modes arise from the competition between the superradiant amplification caused by tunneling through the outer potential barrier and the leakage of modes through the inner potential barrier into the black hole.
Forward citations
Cited by 2 Pith papers
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Spin-induced Scalarized Black Holes in Einstein-Maxwell-scalar Models
Spin-induced scalarized Kerr-Newman black holes are constructed numerically for negative coupling, and they coexist with stable, entropically favored Kerr-Newman black holes.
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A charged black hole in Einstein-cubic gravity, built from first-law consistency and a continued fraction metric, amplifies charged scalar waves below the standard Reissner-Nordstrom superradiance threshold, with stro...
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