X-ray non-detections of old millisecond pulsars constrain the Galactic magnetic-monopole flux to below about 6e-19 cm^-2 s^-1 sr^-1 for QCD-scale catalysis, the strongest bound in the 1e11-1e13 GeV mass range.
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Constraints on magnetic monopoles from X-ray observations of neutron stars
X-ray non-detections of old millisecond pulsars constrain the Galactic magnetic-monopole flux to below about 6e-19 cm^-2 s^-1 sr^-1 for QCD-scale catalysis, the strongest bound in the 1e11-1e13 GeV mass range.