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

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arxiv 2306.17215 v4 pith:IRKCI45Y submitted 2023-06-29 astro-ph.GA astro-ph.IMgr-qc

GRAVITY Collaboration: A. Foschi , R. Abuter , N. Aimar , P. Amaro Seoane , A. Amorim , M. Bauböck , J.P. Berger , H. Bonnet
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G. Bourdarot W. Brandner V. Cardoso Y. Clénet Y. Dallilar R. Davies P.T. de Zeeuw D. Defrère J. Dexter A. Drescher A. Eckart F. Eisenhauer M.C. Ferreira N.M. Förster Schreiber P.J.V. Garcia F. Gao E. Gendron R. Genzel S. Gillessen T. Gomes M. Habibi X. Haubois G. Hei{ss}el T. Henning S. Hippler S.F. Hönig M. Horrobin L. Jochum L. Jocou A. Kaufer P. Kervella L. Kreidberg S. Lacour V. Lapeyrère J.B. Le Bouquin P. Léna D. Lutz F. Millour T. Ott T. Paumard K. Perraut G. Perrin O. Pfuhl S. Rabien D.C. Ribeiro M. Sadun Bordoni S. Scheithauer J. Shangguan T. Shimizu J. Stadler O. Straub C. Straubmeier E. Sturm C. Sykes L.J. Tacconi F. Vincent S. von Fellenberg F. Widmann E. Wieprecht E. Wiezorrek J. Woillez
This is my paper · ORCID
classification astro-ph.GAastro-ph.IMgr-qc
keywords centrecloudscalararoundconstraingalacticmassmotion
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Cited by 4 Pith papers

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  1. Probing Fundamental Constant Oscillation in the Galactic Center with S-Star Spectroscopy

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Time-resolved spectroscopy of S-stars around Sgr A* can probe oscillations of the fine-structure constant induced by superradiant axion clouds or dark-matter soliton cores, with future instruments potentially reaching...

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    astro-ph.GA 2024-12 conditional novelty 6.0 of 10

    Fermionic dark matter halos around supermassive black holes can form non-power-law spikes or even density depletions, depending on the fermion mass and degeneracy, instead of the universal r^-3/2 spike of power-law halos.

  3. Probing vector gravitational atoms with eccentric intermediate mass-ratio inspirals

    gr-qc 2024-11 conditional novelty 5.0 of 10

    Eccentric intermediate-mass-ratio inspirals around vector gravitational atoms acquire faster decay, stronger circularization, and negative periastron precession, making the cloud visible to LISA-like detectors.

  4. Schwarzschild-like Black Holes Submerged in an Exponential Density Dark Matter Profile

    gr-qc 2026-07 conditional novelty 4.0 of 10

    An analytic Schwarzschild-like metric with an exponential dark matter halo is constructed and its shadows, quasi-normal modes, and greybody bounds are computed, though several derived expressions have sign errors.

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