Possible evidence of axion stars in HSC and OGLE microlensing events

Sunao Sugiyama; Masahiro Takada; Alexander Kusenko

Physics Letters B (May 2023)

Possible evidence of axion stars in HSC and OGLE microlensing events

Sunao Sugiyama,
Masahiro Takada,
Alexander Kusenko

Affiliations

Sunao Sugiyama: Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS The University of Tokyo, Kashiwa, Chiba 277-8583, Japan; Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Corresponding author at: Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS The University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
Masahiro Takada: Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
Alexander Kusenko: Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS The University of Tokyo, Kashiwa, Chiba 277-8583, Japan; Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, CA, 90095-1547, USA

Journal volume & issue: Vol. 840
p. 137891

Abstract

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Dark matter in the form of axions is expected to form axion stars. Such axion stars could be discovered by microlensing events. In particular, some candidate events reported by Subaru HSC and OGLE can be explained simultaneously if the axion stars with masses of the order of the Earth mass make up about ∼27−13+7 percent of dark matter. For QCD axions, this corresponds to the axion mass in the range 10−9−10−6 eV, which is consistent with the experimental constraints, as well as the cosmological anthropic window of parameters.

Published in Physics Letters B

ISSN: 0370-2693 (Print); 1873-2445 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/physics-letters-b/

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