Superradiant instability of charged scalar field in stringy black hole mirror system

Li, Ran; Zhao, Junkun

doi:10.1140/epjc/s10052-014-3051-8

Cited by 39 publications

(53 citation statements)

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“…Clearly, when the charge of scalar field increases, this critical radius decreases correspondingly. This point has also been observed in [40] where the analytical calculation was present. From the analytical result (9), one can obtain that the critical radius can be approximately given by…”

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confidence: 73%

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

Li¹,

Zhao²

2015

Physics Letters B

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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 values 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.

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confidence: 73%

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

Li¹,

Zhao²

2015

Physics Letters B

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“…(35) in Ref. [25], one can obtain the mirror radius that supports the scalar cloud; it can be approximately given by…”

Section: Numerical Procedures and Resultsmentioning

confidence: 99%

“…To generate the superradiant instability [21,22], the mirror-like boundary condition should be imposed according to the black hole bomb mechanism [23,24]. Analytical and numerical studies of this subject can be found in [25] and [26]. Correspondingly, the scalar clouds are only possible with the mirror-like boundary condition.…”

Section: Introductionmentioning

confidence: 99%

Scalar clouds in charged stringy black hole-mirror system

Zhao

et al. 2015

Eur. Phys. J. C

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It was reported that massive scalar fields can form bound states around Kerr black holes (Herdeiro and Radu, Phys. Rev. Lett. 112:221101, 2014). These bound states are called scalar clouds; they have a real frequency ω = m H , where m is the azimuthal index and 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 ω = q H for a charged scalar field, where q is the charge of the scalar field, and H is the horizon's electrostatic potential. We show that, for the specific set of black hole and scalar field parameters, the clouds are only possible for specific mirror locations r m . It is shown that analytical results of the mirror location r m for the clouds perfectly coincide with numerical results in the q Q 1 regime. We also show that the scalar clouds are also possible when the mirror locations are close to the horizon. Finally, we provide an analytical calculation of the specific mirror locations r m for the scalar clouds in the q Q 1 regime.

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“…It is important to remark that we have another possibility to study the accretion process for this metric, which is by taking A 2 < 0 and using (32) and (33) with a minus of difference. In that case we have ρ > 0 for w > −1 as we required, but u(r ) < 0 for w < −1.…”

Section: Spherically Symmetric Metrics With Horizonsmentioning

confidence: 99%

Accretion processes for general spherically symmetric compact objects

Bahamonde

Jamil

2015

Eur. Phys. J. C

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We investigate the accretion process for different spherically symmetric space-time geometries for a static fluid. We analyze this procedure using the most general black hole metric ansatz. After that, we examine the accretion process for specific spherically symmetric metrics obtaining the velocity of the sound during the process and the critical speed of the flow of the fluid around the black hole. In addition, we study the behavior of the rate of change of the mass for each chosen metric for a barotropic fluid.

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Superradiant instability of charged scalar field in stringy black hole mirror system

Cited by 39 publications

References 50 publications

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

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

Scalar clouds in charged stringy black hole-mirror system

Accretion processes for general spherically symmetric compact objects

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