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Axion Star Nucleation in Dark Minihalos around Primordial Black Holes
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abstract
We consider a general class of axion models, including the QCD and string axion, in which the PQ symmetry is broken before or during inflation. Assuming the axion is the dominant component of the dark matter, we discuss axion star formation in virialized dark minihalos around primordial black holes through gravitational Bose-Einstein condensation. We determine the conditions for minihalos to kinetically produce axion stars before galaxy formation. Today, we expect up to $\sim 10^{17}$ ($\sim 10^9$) axion stars in a radius of 100 parsecs around the Sun for the case of the QCD (string) axion.
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Cited by 1 Pith paper
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Indirect detection of the QCD axion
A GBT X-band search for axion minicluster-neutron star radio transients in M31 found no 5-sigma candidates, yielding sensitivity to QCD axions in the 33-42 micro-eV mass range.
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