The paper derives a first bound on the dimensionless axion-photon coupling gγ from pulsar polarization data, reporting |gγ|<0.93 at 1σ for axion masses below 10^-11 eV, via a neutron-star-induced axion field.
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First Constraint on Axion-Photon Coupling $g_{\gamma}$ from Neutron Star Observations
The paper derives a first bound on the dimensionless axion-photon coupling gγ from pulsar polarization data, reporting |gγ|<0.93 at 1σ for axion masses below 10^-11 eV, via a neutron-star-induced axion field.