Tidal heating of black holes and exotic compact objects on the brane

Chakraborty, Sumanta; Datta, Sayak; Sau, Subhadip

doi:10.1103/physrevd.104.104001

Cited by 23 publications

(6 citation statements)

References 60 publications

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“…We now consider one of the most well-motivated high-energy physics models: the Randall-Sundrum II (RSII) brane-world model, which has been tested over a wide range of scales and using an enormous variety of probes (see e.g. [712][713][714][715][716][717][718][719][720][721][722][723][724][725][726]). This is an AdS 5 brane-world model where the extra dimension has an infinite size and negative bulk cosmological constant [727].…”

Section: Brane-world Black Holesmentioning

confidence: 99%

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Vagnozzi

Roy

Tsai

et al. 2023

Class. Quantum Grav.

280

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Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We consider a wide range of well-motivated deviations from classical General Relativity (GR) BH solutions, and constrain them using the Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), connecting the size of the bright ring of emission to that of the underlying BH shadow and exploiting high-precision measurements of Sgr A*’s mass-to-distance ratio. The scenarios we consider, and whose fundamental parameters we constrain, include various regular BHs, string-inspired space-times, violations of the no-hair theorem driven by additional fields, alternative theories of gravity, novel fundamental physics frameworks, and BH mimickers including well-motivated wormhole and naked singularity space-times. We demonstrate that the EHT image of Sgr A* places particularly stringent constraints on models predicting a shadow size larger than that of a Schwarzschild BH of a given mass, with the resulting limits in some cases surpassing cosmological ones. Our results are among the first tests of fundamental physics from the shadow of Sgr A* and, while the latter appears to be in excellent agreement with the predictions of GR, we have shown that a number of well-motivated alternative scenarios, including BH mimickers, are far from being ruled out at present.

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Section: Brane-world Black Holesmentioning

confidence: 99%

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Vagnozzi

Roy

Tsai

et al. 2023

Class. Quantum Grav.

280

View full text Add to dashboard Cite

show abstract

“…Though the resultsby and large -are consistent with that of a general relativistic black hole, there is room for alternatives [12][13][14][15][16][17][18]. In particular, if stellar structures can exist within the region between the black hole horizon and the photon sphere, the gravitational wave signal, within the current experimental errors, will very much look like that of a general relativistic black hole [19][20][21][22][23][24][25][26]. Therefore, the existence of such stellar structures and study of their physical properties are always encouraging in its own right.…”

Section: Introductionmentioning

confidence: 62%

Universality of the Buchdahl sphere

Chakraborty¹,

Dadhich²

2022

Preprint

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Buchdahl sphere, the limiting stable isotropic stellar structure without exotic matter, plays a very important role, as far as the near horizon physics is concerned. This is because, the radius of the Buchdahl sphere lies between the horizon and the photon sphere, such that the signal arising from gravitational wave and black hole shadow will mimic that of a black hole. Here, we show certain universal properties associated with the Buchdahl sphere, in the sense that these properties will not change even if electric charge is included in the stellar structure. Moreover, these universal properties transcend general relativity and holds good in pure Lovelock theories of gravity as well. Using these universalities, we have proposed a Buchdahl limit for rotating stellar configuration. Finally, the universality of the Buchdahl limit in terms of the gravitational and non-gravitational field energies and also in terms of the photon sphere is also discussed.

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“…In this section, we shall discuss the opposite scenario where the background spacetime inherits quantum corrections, while the membrane remains classical. Such a scenario naturally arises in the context of braneworld BHs [38,53] whose various observational signatures have been studied in [54][55][56][57][58][59][60]. We shall first provide the spacetime geometry of the braneworld BH, and then discuss the quantum origin of such a solution.…”

Section: Membrane Paradigm For Bhs On the Branementioning

confidence: 99%

Implications of the quantum nature of the black hole horizon on the gravitational-wave ringdown

Chakraborty,

Maggio,

Mazumdar

et al. 2022

Preprint

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Motivated by capturing putative quantum effects at the horizon scale, we model the black hole horizon as a membrane with fluctuations following a Gaussian profile. By extending the membrane paradigm at the semiclassical level, we show that the quantum nature of the black hole horizon implies partially reflective boundary conditions and a frequency-dependent reflectivity. This generically results into a modified quasi-normal mode spectrum and the existence of echoes in the postmerger signal. On a similar note, we derive the horizon boundary condition for a braneworld black hole that could originate from quantum corrections on the brane. This scenario also leads to a modified gravitational-wave ringdown. We discuss general implications of these findings for scenarios predicting quantum corrections at the horizon scale.

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Tidal heating of black holes and exotic compact objects on the brane

Cited by 23 publications

References 60 publications

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Universality of the Buchdahl sphere

Implications of the quantum nature of the black hole horizon on the gravitational-wave ringdown

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