Constraining meV axion dark matter with ALMA observations of the galactic center magnetar SGR 1745–2900
Javier De Miguel; Evanthia Hatziminaoglou; Frédéric Poidevin; Nanda Rea; Daniel L. Walker; Davide De Grandis; Jaime Prieto-Polo · 2026 · Physics Letters B
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Abstract
We report a mm-wave search for axion dark matter from SGR 1745–2900, based on 4.8 h of ALMA observations. No candidate features are found between 133.99–135.78, 135.91–137.70, 145.99–147.78, and 147.99–149.78 GHz, corresponding to 0.55–0.62 meV. Interpreting this null result within a state-of-the-art stellar framework, we derive sensitivity to the axion–photon coupling at the level of gγ≳2×10−11 GeV−1 under a standard Navarro–Frenk–White profile; down to gγ≳2×10−13 GeV−1 upon accounting for a dense dark-matter spike around Sagittarius A*, probing the quantum chromodynamics axion parameter spac
Abstract by Javier De Miguel; Evanthia Hatziminaoglou; Frédéric Poidevin; Nanda Rea; Daniel L. Walker; Davide De Grandis; Jaime Prieto-Polo, Physics Letters B (2026) — licensed CC BY 4.0.
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Metadata source: DOAJ · DOI 10.1016/j.physletb.2026.140567