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Bounds on ultralight bosons from the Event Horizon Telescope observation of Sgr A$^*$

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arxiv 2208.03530 v2 pith:PRI6F3EV submitted 2022-08-06 astro-ph.HE astro-ph.COgr-qchep-phhep-th

Akash Kumar Saha , Priyank Parashari , Tarak Nath Maity , Abhishek Dubey , Subhadip Bouri , Ranjan Laha This is my paper · ORCID
classification astro-ph.HEastro-ph.COgr-qchep-phhep-th
keywords observationulbsultralightvariousbosonsboundseventhorizon
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abstract

Recent observation of Sagittarius A$^*$ (Sgr A$^*$) by the Event Horizon Telescope (EHT) collaboration has uncovered various unanswered questions in black hole (BH) physics. Besides, it may also probe various beyond the Standard Model (BSM) scenarios. One of the most profound possibilities is the search for ultralight bosons (ULBs) using BH superradiance (SR). EHT observations imply that Sgr A$^*$ has a non-zero spin. Using this observation, we derive bounds on the mass of ULBs with purely gravitational interactions. Considering self-interacting ultralight axions, we constrain new regions in the parameter space of decay constant, for a certain spin of Sgr A$^*$. Future observations of various spinning BHs can improve the present constraints on ULBs.

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Cited by 3 Pith papers

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

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    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...

  3. Dark Matter-Independent Orbital Decay Bounds on Ultralight Bosons from OJ287

    hep-ph 2025-05 reject novelty 6.0 of 10

    OJ287 orbital timing excludes ultralight scalar bosons with masses around 0.85 to 2.2 x 10^-21 eV through superradiance-cloud dynamical friction, independent of dark matter assumptions.

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