Abstract
If the thermal evolution of the hot young neutron star in the supernova remnant HESS J1731-347 is driven by neutrino emission, it provides a stringent constraint on the coupling of light (mass ) axion-like particles to neutrons. Using Markov-Chain Monte Carlo we find that for the values of axion-neutron coupling (90% c.l.) the axion cooling from the bremsstrahlung reaction is too rapid to account for the high observed surface temperature. This implies that the Pecci-Quinn scale or axion decay constant for KSVZ axions and for DFSZ axions. The high temperature of this neutron star also allows us to tighten constraints on the size of the nucleon pairing gaps.
5 More- Received 16 June 2018
- Revised 1 August 2018
DOI:https://doi.org/10.1103/PhysRevC.98.035802
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