Using the motion of S2 to constrain scalar clouds around SgrA*

Abstract

The motion of S2, one of the stars closest to the Galactic Centre, has been measured accurately and used to study the compact object at the centre of the Milky Way. It is commonly accepted that this object is a supermassive black hole but the nature of its environment is open to discussion. Here, we investigate the possibility that dark matter in the form of an ultralight scalar field ``cloud'' clusters around Sgr~A*. We use the available data for S2 to perform a Markov Chain Monte Carlo analysis and find the best-fit estimates for a scalar cloud structure. Our results show no substantial evidence for such structures. When the cloud size is of the order of the size of the orbit of S2, we are able to constrain its mass to be smaller than $0.1\%$ of the central mass, setting a strong bound on the presence of new fields in the galactic centre.

Published on MNRAS. References added

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• Gravitational atoms in the braneworld scenario
• Getting More Out of Black Hole Superradiance: a Statistically Rigorous Approach to Ultralight Boson Constraints from Black Hole Spin Measurements
• Probing vector gravitational atoms with eccentric intermediate mass-ratio inspirals
• Constraints on metric-affine gravity black holes from the stellar motion at the Galactic Center
• Constraining a disformal Schwarzschild black hole in DHOST theories with the orbit of the S2 star
• Kerr-scalaron metric and astronomical consequences near the Galactic Center black hole
• Effects of Superradiance in Active Galactic Nuclei
• Neural Network Analysis of S-Star Dynamics: Implications for Modified Gravity
• Probing a Lorentz-violating parameter from orbital precession of the S2 star around the galactic centre supermassive black hole
• Scalar fields around black hole binaries in LIGO-Virgo-KAGRA
• Self-Gravity in Superradiance Clouds: Implications for Binary Dynamics and Observational Prospects
• Neural Network Analysis of S2-Star Dynamics: Extended mass
• Constraining Axion Dark Matter with Galactic-Centre Resonant Dynamics
• S2-star dynamics probing the Galaxy core cluster
• Boson Cloud Atlas: Direct mass measurements of superradiance clouds near black holes
• Sagittarius A* near-infrared flares polarization as a probe of space-time I: Non-rotating exotic compact objects
• Fermionic Dark Matter spikes: origin and growth of Black Hole seeds
• Detecting Lorentz-violation induced by a tensor field with S-star's motion around Sgr A*