The Hawking effect and the bounds on greybody factor for higher dimensional Schwarzschild black holes

Barman, Subhajit

doi:10.1140/epjc/s10052-020-7613-7

Cited by 16 publications

(7 citation statements)

References 117 publications

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“…Although we focus on black hole thermodynamics in General Relativity, our analysis can also be adapted for black holes in alternative theories. In particular, the Hawking radiation increases significantly for black holes in higher-dimensional theories [39][40][41], while it may not follow the usual Stefan-Boltzmann law [42][43][44]. Our analysis may lead to meaningful constraints higher-dimensional theories and provide a more thorough test of black-hole thermodynamics.…”

Section: Discussionmentioning

confidence: 84%

Upper limits on the temperature of inspiraling astrophysical black holes

Chung

Sakellariadou

2021

Eur. Phys. J. C

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We present a method to constrain the temperature of astrophysical black holes through detecting the inspiral phase of binary black hole coalescences. At sufficient separation, inspiraling black holes can be regarded as isolated objects, hence their temperature can still be defined. Due to their intrinsic radiation, inspiraling black holes lose part of their masses during the inspiral phase. As a result, coalescence speeds up, introducing a correction to the orbital phase. We show that this dephasing may allow us to constrain the temperature of inspiraling black holes through gravitational-wave detection. Using the binary black-hole coalescences of the first two observing runs of the Advanced LIGO and Virgo detectors, we constrain the temperature of parental black holes to be less than about $$ 10^9 $$ 10 9 K. Such a constraint corresponds to luminosity of about $$ 10^{-16} M_{\odot }~\mathrm{s}^{-1} $$ 10 - 16 M ⊙ s - 1 for a black hole of $$ 20 M_{\odot } $$ 20 M ⊙ , which is about 20 orders of magnitude below the peak luminosity of the corresponding gravitational-wave event, indicating no evidence for strong quantum-gravity effects through the detection of the inspiral phase.

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Section: Discussionmentioning

confidence: 84%

Upper limits on the temperature of inspiraling astrophysical black holes

Chung

Sakellariadou

2021

Eur. Phys. J. C

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“…In the original work [17], the thermal nature of the Hawking effect is realized through the usage of Bogoliubov transformation between the ingoing and outgoing field modes described in terms of the null coordinates. The Hawking effect can be realized through other various means, like using tunnelling formalism [54][55][56][57][58][59][60], path integral approach [61], conformal symmetry [62], via anomalies [63][64][65], canonical formulation [66][67][68][69], and as an effect of near horizon local instability [70][71][72]. However, the conclusion remains the same, i.e., an asymptotic observer will perceive the BH horizon with some temperature proportional to its surface gravity.…”

Section: Hawking Effect In Radially Deformed Spacetimementioning

confidence: 99%

Thermal behavior of a radially deformed black hole spacetime

Barman

Mukherjee

2021

Eur. Phys. J. C

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In the present article, we study the Hawking effect and the bounds on greybody factor in a spacetime with radial deformation. This deformation is expected to carry the imprint of a non-Einsteinian theory of gravity, but shares some of the important characteristics of general relativity (GR). In particular, this radial deformation will restore the asymptotic behavior, and also allows for the separation of the scalar field equation in terms of the angular and radial coordinates – making it suitable to study the Hawking effect and greybody factors. However, the radial deformation would introduce a change in the locations of the horizon, and therefore, the temperature of the Hawking effect naturally alters. In fact, we observe that the deformation parameter has an enhancing effect on both temperature and bounds on the greybody factor, which introduces a useful distinction with the Kerr spacetime. We discuss these effects elaborately, and broadly study the thermal behavior of a radially deformed spacetime.

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“…In the original work [17], the thermal nature of the Hawking effect is realized through the usage of Bogoliubov transformation between the ingoing and outgoing field modes described in terms of the null coordinates. The Hawking effect can be realized through other various means, like using tunnelling formalism [49][50][51][52][53][54][55], path integral approach [56], conformal symmetry [57], via anomalies [58][59][60], canonical formulation [61][62][63][64], and as an effect of near horizon local instability [65][66][67]. However, the conclusion remains the same, i.e., an asymptotic observer will perceive the BH horizon with some temperature proportional to its surface gravity.…”

Section: Hawking Effect In Radially Deformed Spacetimementioning

confidence: 99%

Thermal behavior of a radially deformed black hole spacetime

Barman¹,

Mukherjee²

2021

Preprint

Self Cite

View full text Add to dashboard Cite

In the present article, we study the Hawking effect and the bounds on greybody factor in a spacetime with radial deformation. This deformation is expected to carry the imprint of a non-Einsteinian theory of gravity, but shares some of the important characteristics of general relativity (GR). In particular, this radial deformation will restore the asymptotic behavior, and also allows for the separation of the scalar field equation in terms of the angular and radial coordinates -making it suitable to study the Hawking effect and greybody factors. However, the radial deformation would introduce a change in the locations of the horizon, and therefore, the temperature of the Hawking effect naturally alters. In fact, we observe that the deformation parameter has an enhancing effect on both temperature and bounds on the greybody factor, which introduces a useful distinction with the Kerr spacetime. We discuss these effects elaborately, and broadly study the thermal behavior of a radially deformed spacetime.

show abstract

The Hawking effect and the bounds on greybody factor for higher dimensional Schwarzschild black holes

Cited by 16 publications

References 117 publications

Upper limits on the temperature of inspiraling astrophysical black holes

Upper limits on the temperature of inspiraling astrophysical black holes

Thermal behavior of a radially deformed black hole spacetime

Thermal behavior of a radially deformed black hole spacetime

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