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Axion effects in the stability of hybrid stars

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arxiv 2206.01631 v2 pith:CGZQUFZR submitted 2022-06-03 hep-ph astro-ph.HEhep-thnucl-th

classification hep-phastro-ph.HEhep-thnucl-th
keywords effectshybridstarsneutronaxionaxionsmassiveagreement
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We investigate the effects of including strong charge-parity (CP) violating effects through axion fields in the microscopic equation of state of massive hybrid neutron stars. We assume that their cores contain deconfined quark matter and include the effects of axions via an effective 't Hooft determinant interaction. The hadronic crusts are described using different approaches in order to make our results more general. We find that the presence of axions stabilizes massive hybrid neutron stars against gravitational collapse by weakening the deconfinement phase transition and bringing it to lower densities. This enables to reproduce hybrid neutron stars in agreement with modern astrophysical constraints.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Properties of QCD axion in two-flavor color superconductive matter with massive quarks

    hep-ph 2025-01 conditional novelty 6.0 of 10

    In a two-flavor NJL model with chiral and diquark condensates, the axion mass and quartic coupling increase at the chiral phase transition when color superconductivity is present.

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