Numerical study of superradiant instability for charged stringy black hole-mirror system

Abstract

We numerically study the superradiant instability of charged massless scalar field in the background of charged stringy black hole with mirror-like boundary condition. We compare the numerical result with the previous analytical result and show the dependencies of this instability upon various parameters of black hole charge $Q$, scalar field charge $q$, and mirror radius $r_m$. Especially, we have observed that imaginary part of BQN frequencies grows with the scalar field charge $q$ rapidly.

5 pages, 5 figures, accepted by PLB. arXiv admin note: text overlap with arXiv:1403.7279

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• Superradiant instability of D-dimensional Reissner-Nordström black hole mirror system
• Quasibound states of charged dilatonic black holes
• Scalar clouds in charged stringy black hole-mirror system
• Resonance Spectra of Caged Stringy Black Hole and Its Spectroscopy
• The spinning Kerr-black-hole-mirror bomb: A lower bound on the radius of the reflecting mirror
• Scalar Clouds and Quasinormal Modes
• Higher-dimensional non-extremal Reissner-Nordstrom black holes, scalar perturbation and superradiance: an analytical study