2022
DOI: 10.48550/arxiv.2205.07787
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Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A$^*$

Abstract: 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, allowing us to test whether the Kerr metric provides a good description of the space-time in the vicinity of the event horizons of supermassive BHs. We consider a wide range of well-motivated deviations from classical General Relativity solutions, and constrain them using the Event Horizon Telescope (EHT) observations of Sagittarius A * (SgrA … Show more

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Cited by 72 publications
(95 citation statements)
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References 223 publications
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“…In other words, if the uncertainties reported by the Keck and VLTI measurements on δ were merely limited to negative values, then the metric in question would certainly be ruled out. To have unified upper bounds from Keck and VLTI measurements for the LVCs, we take their average (δ = −0.06 ± 0.063 [71]) and compare the predicted theoretical fractional deviation from the Schwarzschild at hand with it. In Fig.…”
Section: Constraints On the Sme Coefficients From Sgr A* Compact Objectmentioning
confidence: 99%
See 1 more Smart Citation
“…In other words, if the uncertainties reported by the Keck and VLTI measurements on δ were merely limited to negative values, then the metric in question would certainly be ruled out. To have unified upper bounds from Keck and VLTI measurements for the LVCs, we take their average (δ = −0.06 ± 0.063 [71]) and compare the predicted theoretical fractional deviation from the Schwarzschild at hand with it. In Fig.…”
Section: Constraints On the Sme Coefficients From Sgr A* Compact Objectmentioning
confidence: 99%
“…In Ref. [71] one can find a list of reasons for evaluating the theories via Sgr A*'s shadow, in addition to its counterpart M87*. As a result, upon the recent release of updated and new information on the near-horizon image of Sgr A*, we are faced a spectrum of observational evaluations of different metrics [71]- [83].…”
Section: Introductionmentioning
confidence: 99%
“…( 2), in line with most literature. Cosmological and black hole shadow constraints (assuming a fixed δ) has put an upper bound on δ, which is typically δ O(10 −3 ) or O(10 −4 ) [4][5][6][7][8][9].…”
Section: Introduction: Barrow Entropy and Quantum Gravitymentioning
confidence: 99%
“…Depending on the number of spheres added at each iteration and the scaling factor, the fractal dimension of the resulting sphereflake would be different. Since it is often much more convenient to have an explicit metric to work with, a spherically symmetric black hole metric in the usual coordinates {t, r, θ, φ} that incorporates such an entropy correction was introduced and analyzed in the literature [2,3]. However, this immediately raised a question: in what sense does such a metric describe the underlying geometry?…”
mentioning
confidence: 99%