Microlensing constraints on axion stars including finite lens and source size effects

被引：13

作者：

Fujikura, Kohei ^{[1
]}

Hertzberg, Mark P. ^{[2
]}

Schiappacasse, Enrico D. ^{[3
,4
]}

Yamaguchi, Masahide ^{[5
]}

机构：

[1] Univ Tokyo, Res Ctr Early Universe RESCEU, Grad Sch Sci, Bunkyo Ku, Hongo 7-3-1, Tokyo 1130033, Japan

[2] Tufts Univ, Inst Cosmol, Dept Phys & Astron, Medford, MA 02155 USA

[3] Univ Jyvaskyla, Dept Phys, POB YFL, FI-40014 Jyvaskyla, Finland

[4] Univ Helsinki, Helsinki Inst Phys, POB 64, FIN-00014 Helsinki, Finland

[5] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan

来源：

PHYSICAL REVIEW D | 2021年 / 104卷 / 12期

基金：

芬兰科学院; 美国国家科学基金会;

关键词：

BOSON STARS; LIMITS; HALO;

D O I：

10.1103/PhysRevD.104.123012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A fraction of light scalar dark matter, especially axions, may organize into Bose-Einstein condensates, gravitationally bound clumps, "boson stars", and be present in large number in galactic halos today. We compute the expected number of gravitational microlensing events of clumps composed of the ordinary QCD axion and axionlike particles and derive microlensing constraints from the EROS-2 survey and the Subaru Hyper Suprime-Cam observation. We perform a detailed lensing calculation, including the finite lens and source size effects in our analysis. We constrain the axion mass in terms of the fraction of dark matter collapsed into clumps, the individual clump densities, and the axion self-coupling. We also consider and constrain clumps composed of a generic scalar dark matter candidate with repulsive self-interactions. Our analysis opens up a new window for the potential discovery of dark matter.

引用

页数：20