Scalar clouds in charged stringy black hole-mirror system

Abstract

It is reported that massive scalar fields can form bound states around Kerr black holes [C. Herdeiro, and E. Radu, Phys. Rev. Lett. 112, 221101 (2014)]. These bound states are called scalar clouds, which have a real frequency $\omega =m{\Omega }_H$, where $m$ is the azimuthal index and ${\Omega }_H$ is the horizon angular velocity of Kerr black hole. In this paper, we study scalar clouds in a spherically symmetric background, i.e. charged stringy black holes, with the mirror-like boundary condition. These bound states satisfy the superradiant critical frequency condition $\omega =q{\Phi }_H$ for the charged scalar field, where $q$ is the charge of scalar field, and ${\Phi }_H$ is the horizon electrostatic potential. We show that, for the specific set of black hole and scalar field parameters, the clouds are only possible for the specific mirror locations $r_m$. It is shown that the analytical results of mirror location $r_m$ for the clouds are perfectly coincide with the numerical results. We also show that the scalar clouds are also possible when the mirror locations are close to the horizon. At last, we provide an analytical calculation of the specific mirror locations $r_m$ for the scalar clouds in the $qQ\gg 1$ regime.

6 pages, 7 figures. Analytical Study of clouds in $qQ\gg 1$ regime is added

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• Analytic treatment of the system of a Kerr-Newman black hole and a charged massive scalar field
• Quasibound states of charged dilatonic black holes
• Charged black hole bombs in a Minkowski cavity
• Scalar clouds around Kerr-Sen black holes
• Time domain analysis of superradiant instability for the charged stringy black hole-mirror system
• Spectroscopy of Rotating Linear Dilaton Black Holes From Boxed Quasinormal Modes
• Evading no-hair theorems: hairy black holes in a Minkowski box
• Dynamical formation of a hairy black hole in a cavity from the decay of unstable solitons
• Time evolutions of scalar field perturbations in $D$-dimensional Reissner-Nordström Anti-de Sitter black holes
• The instability spectra of near-extremal Reissner-Nordström-de Sitter black holes
• The spinning Kerr-black-hole-mirror bomb: A lower bound on the radius of the reflecting mirror
• Analytical Study of a Kerr-Sen Black Hole and a Charged Massive Scalar Field
• The Weak Cosmic Censorship Conjecture in Hairy Kerr Black Holes
• Phase diagram of the charged black hole bomb system
• De-singularizing the extremal GMGHS black hole via higher derivatives corrections
• Boson stars and solitons confined in a Minkowski box
• Scalar Clouds and Quasinormal Modes