Joule-Thomson expansion for noncommutative uncharged black holes

Graça, J. P. Morais; Capossoli, Eduardo Folco; Boschi-Filho, Henrique

doi:10.1209/0295-5075/ac24c1

Cited by 9 publications

(5 citation statements)

References 58 publications

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“…Given this choice of mass distribution, the corresponding BH solution was studied in [1347] by constructing the (covariantly conserved) energy-momentum tensor corresponding to the energy density of equation (135). The final result is that the metric function describing NCG-inspired BHs within this scenario is given by [1347] (see also [1348][1349][1350][1351][1352][1353][1354][1355][1356][1357][1358][1359][1360][1361][1362] for further works on NCGinspired BHs):…”

Section: Non-commutative Geometrymentioning

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.

156

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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: Non-commutative Geometrymentioning

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.

156

View full text Add to dashboard Cite

show abstract

“…[ 46 ] These works indicated that, different from the van der Waals‐like fluid, the black hole in the AdS space has only a minimum inversion temperature, without a maximum one. The successive studies in various extended theories of gravity further confirmed these conclusions, [ 47–84 ] and the basic reason is the slight difference between the EoS of the black hole and the van der Waals‐like fluid.…”

Section: Introductionmentioning

confidence: 75%

The Joule–Thomson and Joule–Thomson‐Like Effects of the Black Holes in a Cavity

2023

Fortschritte der Physik

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When a black hole is enclosed in a cavity in asymptotically flat space, an effective volume can be introduced, and an effective pressure can be further defined as its conjugate variable. By this means, an extended phase space is constructed in a cavity, which resembles that in the anti‐de Sitter (AdS) space in many aspects. However, there are still some notable dissimilarities simultaneously. In this work, the Joule–Thomson (JT) effect of the black holes, widely discussed in the AdS space as an isenthalpic (constant‐mass) process, is shown to only have cooling region in a cavity. On the contrary, in a constant‐thermal‐energy process (the JT‐like effect), there is only heating region in a cavity. Altogether, different from the AdS case, there is no inversion temperature or inversion curve in a cavity. Our work reveals the subtle discrepancy between the two different extended phase spaces that is sensitive to the specific boundary conditions.

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“…Apart from these, there are several recent studies dealing with Joule-Thomson expansion of black holes in different theories of gravity. [23][24][25][26][27] Being motivated by these studies, in this work, we have considered the Joule-Thomson expansion of a charged anti-de Sitter black hole in the framework of Rastall gravity. In this paper, we shall consider a charged anti-de Sitter black hole surrounded by a quintessence field which has not been considered till now for the study of Joule-Thomson expansion to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Joule‐Thomson Expansion and Optical Behaviour of Reissner‐Nordström‐Anti‐de Sitter Black Holes in Rastall Gravity Surrounded by a Quintessence Field

Gogoi

Sekhmani

Kalita

et al. 2023

Fortschritte der Physik

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This paper deals with the thermodynamics, Joule‐Thomson expansion and optical behaviour of a Reissner‐Nordström‐anti‐de Sitter black hole in Rastall gravity surrounded by a quintessence field. The black hole solution obtained in this framework is different from a corresponding black hole in General Relativity. The black hole metric function, as well as the Hawking temperature, is affected by the presence of energy‐momentum conservation violation. The presence of energy‐momentum conservation violation also affects the isenthalpic and inversion temperature curves, and with an increase in the Rastall parameter, the inversion temperature rises slowly. The impacts of other parameters, such as charge, structural constant etc., are investigated and compared. The black hole shadow, as well as the energy emission rate of the black hole, decreases with an increase in the Rastall parameter. Hence, the black holes evaporate slowly in presence of energy‐momentum conservation violation.

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Joule-Thomson expansion for noncommutative uncharged black holes

Cited by 9 publications

References 58 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 ∗

The Joule–Thomson and Joule–Thomson‐Like Effects of the Black Holes in a Cavity

Joule‐Thomson Expansion and Optical Behaviour of Reissner‐Nordström‐Anti‐de Sitter Black Holes in Rastall Gravity Surrounded by a Quintessence Field

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