Abstract
In this paper, we study the superradiant instability of slowly rotating Kerr–Newman (sKN) black holes under a charged massive scalar perturbation. These black holes resemble closer the Reissner–Nordström black holes than the Kerr–Newman black holes. From the scalar potential analysis, we find that the superradiant instability is not allowed in the sKN black holes because the condition for a trapping well is not compatible with the superradiance condition. However, the rate of energy extraction might grow exponentially if the sKN black hole is placed inside a reflecting cavity. Finally, we obtain two conditions for the trapping well to possess quasibound states in the sKN black holes by analyzing asymptotic scalar potential and far-region wave functions.
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