Axion star nucleation in dark minihalos around primordial black holes
Hertzberg, M. P., Schiappacasse, E. D., & Yanagida, T. T. (2020). Axion star nucleation in dark minihalos around primordial black holes. Physical Review D, 102(2), Article 023013. https://doi.org/10.1103/PhysRevD.102.023013
Published inPhysical Review D
© 2020 American Physical Society
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 similar to 10(17) (similar to 10(9)) axion stars in a radius of 100 parsecs around the Sun for the case of the QCD (string) axion.
PublisherAmerican Physical Society
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Additional information about fundingT. T. Y. is supported in part by the China Grant for TalentScientific Start-Up Project and the JSPS Grant-in-Aid forScientific Research Grants No. 16H02176, No. 17H02878,and No. 19H05810 and by World Premier InternationalResearch Center Initiative (WPI Initiative), MEXT,Japan. M. P. H. is supported in part by National ScienceFoundation Grant No. PHY-1720332.
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