Test of the Einstein Equivalence Principle near the Galactic Center Supermassive Black Hole

Amorim, A.; Bauböck, M.; Berger, Jean–Philippe; Brandner, W.; Clénet, Y.; Foresto, V. Coudé du; Zeeuw, P. T. de; Dexter, Jason; Duvert, G.; Ebert, M.; Eckart, A.; Eisenhauer, F.; Schreiber, N. M. Förster; Garcia, Paulo J. V.; Gao, F.; Gendron, É.; Genzel, R.; Gillessen, S.; Habibi, M.; Haubois, X.; Henning, Th.; Hippler, S.; Horrobin, M.; Hubert, Z.; Jiménez-Rosales, A.; Jocou, L.; Kervella, P.; Lacour, S.; Lapeyrère, V.; Bouquin, J.-B. Le; Léna, Pierre; Ott, Thomas; Paumard, T.; Perraut, K.; Perrin, G.; Pfuhl, O.; Rabien, S.; Rodríguez-Coira, G.; Rousset, G.; Scheithauer, S.; Sternberg, A.; Straub, O.; Straubmeier, C.; Sturm, E.; Tacconi, L. J.; Vincent, F.; Fellenberg, S. von; Waisberg, I.; Widmann, F.; Wieprecht, E.; Wiezorrek, E.; Yazici, S.

doi:10.1103/physrevlett.122.101102

Cited by 46 publications

(30 citation statements)

References 58 publications

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“…2.2. Two supermassive BHs have been studied, namely the Sgr A * source and the BH at the center of M87, whose imaging requires the lowest angular resolution [8,[12][13][14][454][455][456][457].…”

Section: Bounds With Shadows: Sgr a * And M87mentioning

confidence: 99%

Testing the nature of dark compact objects: a status report

2019

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Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. The standard astrophysical description of collapsing objects tells us that massive, dark and compact objects are black holes. Any observation suggesting otherwise would be an indication of beyond-the-standard-model physics. Null results strengthen and quantify the Kerr black hole paradigm. The advent of gravitationalwave astronomy and precise measurements with very long baseline interferometry allow one to finally probe into such foundational issues. We overview the physics of exotic dark compact objects and their observational status, including the observational evidence for black holes with current and future experiments.

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Section: Bounds With Shadows: Sgr a * And M87mentioning

confidence: 99%

Testing the nature of dark compact objects: a status report

2019

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“…S0-38/S38 [26]), allowing us to improve significantly the current constraints (by up to 4 orders of magnitude) and allowing one to probe the fine structure constant in a higher gravitational potential. Finally, after the search for a fifth force [27,32], the relativistic redshift measurement of the star S0-2/S2 [28,30] and a null test of the local position invariance using S0-2/S2 measurements [31], this analysis gives a new example of implications of GC measurements in term of fundamental physics.…”

Section: Lowermentioning

confidence: 99%

“…The motion of the short-period stars (S-stars) orbiting around the 4 × 10 6 M supermassive black hole (SMBH) at the center of our Galaxy has been monitored for 25 years by two experiments: one carried out at the Keck Observatory [26][27][28] and the other with the New Technology Telescope (NTT) and with the Very Large Telescope (VLT) [29][30][31]. Recently, these measurements have opened a new window to probe fundamental physics around a SMBH.…”

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Search for a Variation of the Fine Structure Constant around the Supermassive Black Hole in Our Galactic Center

Hees

Roberts

et al. 2020

Phys. Rev. Lett.

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Searching for space-time variations of the constants of Nature is a promising way to search for new physics beyond General Relativity and the standard model motivated by unification theories and models of dark matter and dark energy. We propose a new way to search for a variation of the fine-structure constant using measurements of late-type evolved giant stars from the S-star cluster orbiting the supermassive black hole in our Galactic Center. A measurement of the difference between distinct absorption lines (with different sensitivity to the fine structure constant) from a star leads to a direct estimate of a variation of the fine structure constant between the star's location and Earth. Using spectroscopic measurements of 5 stars, we obtain a constraint on the relative variation of the fine structure constant below 10 −5 . This is the first time a varying constant of Nature is searched for around a black hole and in a high gravitational potential. This analysis shows new ways the monitoring of stars in the Galactic Center can be used to probe fundamental physics.

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“…solutions of integral equations (22), (23) and (24) for the primary images of compact gas clumps at the fixed radius in the accretion disk. In fact, the event horizon silhouettes, very similar to those shown in Figs.…”

Section: Silhouette Of the Event Horizonmentioning

confidence: 99%

Event horizon silhouette: implications to supermassive black holes in the galaxies M87 and Milky Way

2019

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We demonstrate that a dark silhouette of the black hole illuminated by a thin accretion disk and seen by a distant observer is, in fact, a silhouette of the event horizon hemisphere. The boundary of this silhouette is a contour of the event horizon equatorial circle if a thin accretion disk is placed in the black hole equatorial plane. A luminous matter plunging into black hole from different directions provides the observational opportunity for recovering a total silhouette of the invisible event horizon globe. The event horizon silhouette is projected on the celestial sphere within a position of the black hole shadow. A relative position of brightest point in the accretion disk with respect to the position of event horizon silhouette in the image of black hole in the galaxy M87, observed by the Event Horizon Telescope, corresponds to a rather high value of the black hole spin, a ≃ 0.75.

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Test of the Einstein Equivalence Principle near the Galactic Center Supermassive Black Hole

Cited by 46 publications

References 58 publications

Testing the nature of dark compact objects: a status report

Testing the nature of dark compact objects: a status report

Search for a Variation of the Fine Structure Constant around the Supermassive Black Hole in Our Galactic Center

Event horizon silhouette: implications to supermassive black holes in the galaxies M87 and Milky Way

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