First Constraint on Axion-Photon Coupling $g_{\gamma }$ from Neutron Star Observations

Jun-Chen Wang, Shunshun Cao, Jinchen Jiang +3

We propose a novel method to detect axions which uniquely depends on the dimensionless axion-photon coupling $g_{\gamma }$, independent of the suppressive axion decay constant $f_a$. Using…