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arxiv: 1405.4931 · v4 · pith:N2ESIY6Fnew · submitted 2014-05-20 · ✦ hep-th · gr-qc

Stability of Reissner-Nordstr\"om black hole in de Sitter background under charged scalar perturbation

classification ✦ hep-th gr-qc
keywords instabilityangularblackchargedperturbationsscalarsitterbackground
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We find a new instability in the four-dimensional Reissner-Nordstrom-de Sitter black holes against charged scalar perturbations with vanishing angular momentum, $l=0$. We show that such an instability is caused by superradiance. The instability does not occur for an larger angular index, as explicitely proven for $l=1$. Our results are obtained from a numerical investigation of the time domain profiles of the perturbations.

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