Using eclipse attenuation in the LMC X-4 neutron star binary, the authors set g_aγ ≤ 1.44 × 10^{-10} GeV^{-1} at 90% CL, surpassing current light-shining-through-walls bounds.
X-ray observations of isolated neutron stars
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A model incorporating magnetic field decay and post-birth re-emergence explains why kinematic ages exceed characteristic ages in most magnetars.
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Neutron Star Eclipses as Axion Laboratories
Using eclipse attenuation in the LMC X-4 neutron star binary, the authors set g_aγ ≤ 1.44 × 10^{-10} GeV^{-1} at 90% CL, surpassing current light-shining-through-walls bounds.
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A phenomenological model of the magnetic field re-emergence in magnetars and discrepancy between the kinematic and characteristic ages
A model incorporating magnetic field decay and post-birth re-emergence explains why kinematic ages exceed characteristic ages in most magnetars.