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Axion constraints from quiescent soft gamma-ray emission from magnetars
Axion-like-particles (ALPs) emitted from the core of a magnetar can convert to photons in its magnetosphere. The resulting photon flux is sensitive to the product of (i) the ALP-nucleon coupling ${G}_{an}$ which controls the production cross section in the core and (ii) the ALP-photon coupling ${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}$ which controls the conversion …