Greybody factor of a scalar field from Reissner–Nordström–de Sitter black hole

Ahmed, Jamil; Saifullah, Khalid

doi:10.1140/epjc/s10052-018-5800-6

Cited by 28 publications

(16 citation statements)

References 24 publications

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“…However, the radial equation is hard to solve analytically in general. Most of the analytical studies were done with some approximation such as the frequency tends to zero or the black hole is very small [7,[58][59][60][61][62][63]. In this paper, we solve the radial equations numerically to study the whole parameter region.…”

Section: Jhep08(2020)105 4 the Amplification Factor Of The Superradiancementioning

confidence: 99%

Superradiance and stability of the regularized 4D charged Einstein-Gauss-Bonnet black hole

Zhang

et al. 2020

J. High Energ. Phys.

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We investigated the superradiance and stability of the regularized 4D charged Einstein-Gauss-Bonnet black hole which is recently inspired by Glavan and Lin [Phys. Rev. Lett. 124, 081301 (2020)]. We found that the positive Gauss-Bonnet coupling constant α enhances the superradiance, while the negative α suppresses it. The condition for superradiant instability is proved. We also worked out the quasinormal modes (QNMs) of the charged Einstein-Gauss-Bonnet black hole and found that the real part of all the QNMs does not satisfy the superradiance condition and the imaginary parts are all negative. Therefore this black hole is stable. When α makes the black hole extremal, there are normal modes.

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Section: Jhep08(2020)105 4 the Amplification Factor Of The Superradiancementioning

confidence: 99%

Superradiance and stability of the regularized 4D charged Einstein-Gauss-Bonnet black hole

Zhang

et al. 2020

J. High Energ. Phys.

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“…The comparison of the analytical result with the numerical result was done in [35]. For more studies, see [36][37][38][39][40][41][42][43][44][45][46][47][48]. Adopting a similar radial coordinate, we are able to derive the analytical results for the greybody factors for arbitrary partial modes of a scalar field in the EGB-dS black hole spacetime as well.…”

Section: Introductionmentioning

confidence: 99%

Greybody factors for a spherically symmetric Einstein-Gauss-Bonnet–de Sitter black hole

Zhang

Chen

2018

Phys. Rev. D

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We study the greybody factors of the scalar fields in spherically symmetric Einstein-Gauss-Bonnet-de Sitter black holes in higher dimensions. We derive the greybody factors analytically for both minimally and non-minimally coupled scalar fields. Moreover, we discuss the dependence of the greybody factor on various parameters including the angular momentum number, the non-minimally coupling constant, the spacetime dimension, the cosmological constant and the Gauss-Bonnet coefficient in detail. We find that the non-minimal coupling may suppress the greybody factor and the Gauss-Bonnet coupling could enhance it, but they both suppress the energy emission rate of Hawking radiation. *

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“…The greybody factors for a massive scalar field were analyzed in [28], and it was shown there that Universality is respected only under certain restrictions of the parameters involved. Lately, there is an interest in studying and analysing the greybody factors for scalar fields with a nonzero coupling to the scalar curvature [29,30,31,32]. In particular, in [29] it was shown that the greybody factor in the low energy regime and in the zero angular-momentum case tends to zero like ω 2 .…”

Section: Introductionmentioning

confidence: 99%

Greybody factors for a nonminimally coupled scalar field in BTZ black hole background

Panotopoulos¹,

Rincón²

2017

Physics Letters B

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In the present work we study the propagation of a probe nonminimally coupled scalar field in BTZ black hole background. We find analytical expressions for the reflection coefficient, the absorption cross-section, and the decay rate in the strong coupling case, where the nonminimal coupling is larger than its conformal value ξ c = 1/6. Our main results are summarized in several figures, in which we show how the behavior of the aforementioned quantities depends on the parameters of the theory. Our findings show that i) the reflection coefficient tends to zero only for a nonminimal coupling ξ ≥ 0.25, and ii) in the zero angular-momentum case the greybody factor in the low energy regime tends to a finite constant that generically does not coincide with the area of the horizon of the black hole. There is, however, a special case in which this holds.

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Greybody factor of a scalar field from Reissner–Nordström–de Sitter black hole

Cited by 28 publications

References 24 publications

Superradiance and stability of the regularized 4D charged Einstein-Gauss-Bonnet black hole

Superradiance and stability of the regularized 4D charged Einstein-Gauss-Bonnet black hole

Greybody factors for a spherically symmetric Einstein-Gauss-Bonnet–de Sitter black hole

Greybody factors for a nonminimally coupled scalar field in BTZ black hole background

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