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High Energy Physics - Phenomenology

arXiv:2109.13153 (hep-ph)
[Submitted on 27 Sep 2021 (v1), last revised 25 Nov 2021 (this version, v2)]

Title:Can QCD Axion Stars explain Subaru HSC microlensing?

Authors:Enrico D. Schiappacasse, Tsutomu T. Yanagida
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Abstract:A non-negligible fraction of the QCD axion dark matter may form gravitationally bound Bose Einstein condensates, which are commonly known as axion stars or axion clumps. Such astrophysical objects have been recently proposed as the cause for the single candidate event reported by Subaru Hyper Suprime-Cam (HSC) microlensing search in the Andromeda galaxy. Depending on the breaking scale of the Peccei-Quinn symmetry and the details of the dark matter scenario, QCD axion clumps may form via gravitational condensation during radiation domination, in the dense core of axion miniclusters, or within axion minihalos around primordial black holes. We analyze all these scenarios and conclude that the microlensing candidate detected by the Subaru HSC survey is likely not caused by QCD axion stars.
Comments: 7 pages, 2 figures. V2: Updated towards version published in Physical Review D
Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:2109.13153 [hep-ph]
  (or arXiv:2109.13153v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2109.13153
Journal reference: Phys. Rev. D 104, 103020 (2021)
Related DOI: https://doi.org/10.1103/PhysRevD.104.103020

Submission history

From: Enrico Schiappacasse [view email]
[v1] Mon, 27 Sep 2021 16:07:36 UTC (236 KB)
[v2] Thu, 25 Nov 2021 20:21:34 UTC (236 KB)
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