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Hydrogen Axion Star: Metallic Hydrogen Bound to a QCD Axion BEC
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abstract
As a cold dark matter candidate, the QCD axion may form Bose-Einstein condensates, called axion stars, with masses around $10^{-11}\,M_{\odot}$. In this paper, we point out that a brand new astrophysical object, a Hydrogen Axion Star (HAS), may well be formed by ordinary baryonic matter becoming gravitationally bound to an axion star. We study the properties of the HAS and find that the hydrogen cloud has a high pressure and temperature in the center and is likely in the liquid metallic hydrogen state. Because of the high particle number densities for both the axion star and the hydrogen cloud, the feeble interaction between axion and hydrogen can still generate enough internal power, around $10^{13}~\mbox{W}\times(m_a/5~\mbox{meV})^4$, to make these objects luminous point sources. High resolution ultraviolet, optical and infrared telescopes can discover HAS via black-body radiation.
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Cited by 1 Pith paper
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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.
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