Constraints on metric-affine gravity black holes from the stellar motion at the Galactic Center

Abstract

We consider a static, spherically symmetric space-time with an electric field arising from a quadratic metric-affine extension of General Relativity. Such a space-time is free of singularities in the centre of the black holes, while at large distances it quickly boils down to the usual Reissner-Nordström solution. We probe this space-time metric, which is uniquely characterized by two length scales, $r_q$ and $\ell$, using the astrometric and spectroscopic measurements of the orbital motion of the S2 star around the Galactic Center. Our analysis constrains $r_q$ to be below $2.7M$ for values $\ell <120AU$, strongly favouring a central object that resembles a Schwarzschild black hole.

11 pages, 5 figures, 1 table

References in corpus (22)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• Palatini Approach to Modified Gravity: f(R) Theories and Beyond
• Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
• An Update on Monitoring Stellar Orbits in the Galactic Center
• The 1965 Penrose singularity theorem
• Regular black holes: A short topic review
• Constraints on $R^n$ gravity from precession of orbits of S2-like stars
• Dynamically important magnetic fields near the event horizon of Sgr A*
• Orbital precession of the S2 star in Scalar-Tensor-Vector-Gravity
• The Flux Distribution of Sgr A*
• $f(R)$-gravity after the detection of the orbital precession of the S2 star around the Galactic centre massive black hole
• Regular Black Holes: Towards a New Paradigm of Gravitational Collapse
• Observational Constraints in Metric-Affine Gravity
• Using the motion of S2 to constrain scalar clouds around SgrA*
• Unveiling the nature of SgrA* with the geodesic motion of S-stars
• Are nonsingular black holes with super-Planckian hair ruled out by S2 star data?
• The Galactic Center as a laboratory for theories of gravity and dark matter
• Bounding the mass of ultralight bosonic Dark Matter particles with the motion of the S2 star around Sgr A*
• Testing Horndeski gravity with S2 star orbit
• Narrowing the allowed mass range of ultralight bosons with the S2 star
• Response to: Comment on "Orbital precession of the S2 star in scalar-tensor-vector gravity"

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• Observational test of ${\mathcal{R}}^2$ spacetimes with the S2 star in the Milky Way galactic center
• Future prospects for measuring 1PPN parameters using observations of S2 and S62 at the Galactic Center
• Gravitational signatures beyond Newton: exploring hierarchical three-body dynamics
• Algebraic classification of the gravitational field in general metric-affine geometries