Constraining meV axion dark matter with ALMA observations of the galactic center magnetar SGR 1745─2900

Bibcode
2026PhLB..87840567D
DOI
10.1016/j.physletb.2026.140567
De Miguel, Javier; Hatziminaoglou, Evanthia; Poidevin, Frédéric; Rea, Nanda; Walker, Daniel L.; De Grandis, Davide; Prieto-Polo, Jaime
Bibliographical reference

Physics Letters B

Advertised on:
7
2026
Number of authors
7
IAC number of authors
3
Citations
2
Refereed citations
0
Description
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 space.
Type
Refereed
Dark matter
Pulsars
Magnetars

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