Study of null and time-like geodesics in the exterior of a Schwarzschild black hole with quintessence and cloud of strings

Fathi, Mohsen; Olivares, Manuel; Villanueva, J. R.

doi:10.1140/epjc/s10052-022-10600-w

Cited by 20 publications

(5 citation statements)

References 66 publications

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“…In both cases, k characterizes a specific hair. See also [1154][1155][1156][1157][1158][1159][1160][1161][1162][1163][1164][1165][1166][1167][1168] for further works on BHs carrying global monopole charges or surrounded by clouds of strings.…”

Section: Black Hole With a Topological Defectmentioning

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.

210

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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: Black Hole With a Topological Defectmentioning

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.

210

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show abstract

“…The string cloud model can provide an explanation for the field theory resulting from the distance interaction between particles, which is associated with a unique behavior of the gravitational field. Assuming that the gravitational field can be created by the elements of the string, we concentrate on the scenario where , as it behaves as an attractive gravitational charge [47].…”

Section: Schwarzschild String Cloud Bh and Effective Potentialmentioning

confidence: 99%

“…Letelier examined the physical characteristics of the string cloud model and obtained a Schwarzschild string cloud BH solution [37]. Recently, researchers have extensively studied various BH properties within the string cloud framework, including thermodynamic behavior [38][39][40][41], BH solutions [42][43][44], BH shadows, and gravitational lensing [45][46][47][48][49]. In this article, we only discuss the effect of strong deflection gravitational lensing and do not investigate weak deflection.…”

Section: Introduction ∼ 100 * * *mentioning

confidence: 99%

Optical appearance of the Schwarzschild black hole in the string cloud context*

Guo¹,

Huang²,

Li³

2023

Chinese Phys. C

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The image of a black hole (BH) consists of direct and secondary images that depend on the observer position. We investigate the optical appearance of a Schwarzschild BH in the context of a string cloud to reveal how the BH's observable characteristics are influenced by the inclination angle, string cloud parameter, and impact parameter. Following Luminet's work [Astron. Astrophys. 75, 228 (1979)], we adopt a semi-analytic method to calculate the total bending angle of the light ray and derive the direct and secondary images of the Schwarzschild string cloud BH. Our results show that an increase in the inclination angle leads to a more pronounced separation of the images. We consider the gravitational redshift and present the redshift distribution of the direct image while illustrating the flux distribution. We observe that the direct image exhibits blueshift and redshift simultaneously, and the asymmetry of the flux distribution increases with the inclination angle. Finally, we obtain the Schwarzschild string cloud BH image via a numerical simulation, which provides an approximate illustration of the EHT resolution.

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“…Other works (see, for example, refs. [28,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46]) also discussed the possible geodesic motions in various spacetimes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Geodesic Motions of Massive Particles in Kerr–Sen–AdS4 Spacetime

Cai,

Liu,

Wang

et al. 2024

Universe

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Study of null and time-like geodesics in the exterior of a Schwarzschild black hole with quintessence and cloud of strings

Cited by 20 publications

References 66 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 ∗

Optical appearance of the Schwarzschild black hole in the string cloud context*

Analysis of the Geodesic Motions of Massive Particles in Kerr–Sen–AdS4 Spacetime

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