Physical laboratory at the center of the Galaxy

Dokuchaev, V. I.; Eroshenko, Yurii N.

doi:10.3367/ufne.0185.201508c.0829

Cited by 48 publications

(40 citation statements)

References 384 publications

(397 reference statements)

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“…An expression for apocenter (pericenter) shifts for Newtonian potential plus small perturbing function is given as a solution in the classical (L & L) textbook [58] (see also applications of the expressions for calculations of stellar orbit precessions in presence of the the supermassive black hole and dark matter at the Galactic Center [59, 60]). In paper [50], the authors derived the expression which is equivalent to the (L & L) relation and which can be used for our needs.…”

Section: Relativistic Precession Evaluationmentioning

confidence: 99%

Constraints on tidal charge of the supermassive black hole at the Galactic Center with trajectories of bright stars

Zakharov

2018

Eur. Phys. J. C

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As it was pointed out recently in Hees et al. (Phys Rev Lett 118:211101, 2017), observations of stars near the Galactic Center with current and future facilities provide an unique tool to test general relativity (GR) and alternative theories of gravity in a strong gravitational field regime. In particular, the authors showed that the Yukawa gravity could be constrained with Keck and TMT observations. Some time ago, Dadhich et al. (Phys Lett B 487:1, 2001) showed that the Reissner–Nordström metric with a tidal charge is naturally appeared in the framework of Randall–Sundrum model with an extra dimension ( is called tidal charge and it could be negative in such an approach). Astrophysical consequences of presence of black holes with a tidal charge are considerered, in particular, geodesics and shadows in Kerr–Newman braneworld metric are analyzed in Schee and Stuchlík (Intern J Mod Phys D 18:983, 2009), while profiles of emission lines generated by rings orbiting braneworld Kerr black hole are considered in Schee and Stuchlík (Gen Relat Grav 52:1795, 2009). Possible observational signatures of gravitational lensing in a presence of the Reissner–Nordström black hole with a tidal charge at the Galactic Center are discussed in papers (Bin-Nun in Phys Rev D 81:123011, 2010; Bin-Nun in Phys Rev D 82:064009, 2010; Bin-Nun in Class Quant Grav 28:114003, 2011). Here we are following such an approach and we obtain analytical expressions for orbital precession for Reissner–Nordström–de-Sitter solution in post-Newtonian approximation and discuss opportunities to constrain parameters of the metric from observations of bright stars with current and future astrometric observational facilities such as VLT, Keck, GRAVITY, E-ELT and TMT.

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Section: Relativistic Precession Evaluationmentioning

confidence: 99%

Constraints on tidal charge of the supermassive black hole at the Galactic Center with trajectories of bright stars

Zakharov

2018

Eur. Phys. J. C

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“…As it was noted earlier, observations of bright star trajectories near the Galactic Center could provide an efficient tool to evaluate a gravitational potential, in particular, analyzing these trajectories one can obtain constraints on parameters of black hole and stellar cluster [103] and on parameters of dark matter distribution [104][105][106][107].…”

Section: Observational Signatures Of Black Holesmentioning

confidence: 99%

Graviton mass bounds from an analysis of bright star trajectories at the Galactic Center

2017

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Abstract. In February 2016 the LIGO & VIRGO collaboration reported the discovery of gravitational waves in merging black holes, therefore, the team confirmed GR predictions about an existence of black holes and gravitational waves in the strong gravitational field limit. Moreover, in their papers the joint LIGO & VIRGO team presented an upper limit on graviton mass such as m g < 1.2 × 10 −22 eV . So, the authors concluded that their observational data do not show any violation of classical general relativity. We show that an analysis of bright star trajectories could constrain graviton mass with a comparable accuracy with accuracies reached with gravitational wave interferometers and the estimate is consistent with the one obtained by the LIGO & VIRGO collaboration. This analysis gives an opportunity to treat observations of bright stars near the Galactic Center as a useful tool to obtain constraints on the fundamental gravity law such as modifications of the Newton gravity law in a weak field approximation. In that way, based on a potential reconstruction at the Galactic Center we obtain bounds on a graviton mass.

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“…The supermassive black hole Sagittarius A* at the Galactic Center provides a natural physical laboratory for experimental verification of General Relativity and recovering the black hole silhouette [1,2,3,4,5,6,7,8,9,10]. A weak accretion activity and a quiescent emission from this dormant quasar provides a chance for surrounding plasma to be transparent in the vicinity of event horizon.…”

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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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Physical laboratory at the center of the Galaxy

Cited by 48 publications

References 384 publications

Constraints on tidal charge of the supermassive black hole at the Galactic Center with trajectories of bright stars

Constraints on tidal charge of the supermassive black hole at the Galactic Center with trajectories of bright stars

Graviton mass bounds from an analysis of bright star trajectories at the Galactic Center

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

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