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.
QCD Axion Star Collapse with the Chiral Potential
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In a previous work, we analyzed collapsing axion stars using the low-energy instanton potential, showing that the total energy is always bounded and that collapsing axion stars do not form black holes. In this paper, we provide a proof that the conclusions are unchanged when using instead the more general chiral potential for QCD axions.
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Properties of QCD axion in two-flavor color superconductive matter with massive quarks
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.