Constraints on Axion-like Particles and Nucleon Pairing in Dense Matter from the Hot Neutron Star in HESS J1731-347

Mikhail V. Beznogov; Ermal Rrapaj; Dany Page; Sanjay Reddy

doi:10.1103/PhysRevC.98.035802

paper

Constraints on Axion-like Particles and Nucleon Pairing in Dense Matter from the Hot Neutron Star in HESS J1731-347

arXiv:1806.07991 · doi:10.1103/PhysRevC.98.035802

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 $≪ 10$ keV) axion-like particles to neutrons. Using Markov-Chain Monte Carlo we find that for the values of axion-neutron coupling $g_{ann}^{2} > 7.7 \times 1 0^{- 20}$ (90% c.l.) the axion cooling from the bremsstrahlung reaction $n + n \to n + n + a$ is too rapid to account for the high observed surface temperature. This implies that the Pecci-Quinn scale or axion decay constant $f_{a} > 6.7 \times 1 0^{7}$ GeV for KSVZ axions and $f_{a} > 1.7 \times 1 0^{9}$ GeV for DFSZ axions. The high temperature of this neutron star also allows us to tighten constraints on the size of the nucleon pairing gaps.

arXiv comment17 pages, 12 figures

Constraints on Axion-like Particles and Nucleon Pairing in Dense Matter from the Hot Neutron Star in HESS J1731-347

Abstract

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