Microlensing constraints on axion stars including finite lens and source size effects
Microlensing constraints on axion stars including finite lens and source size effects
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DOI：
10.1103/physrevd.104.123012
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发表时间：
2021-09
影响因子：
5
通讯作者：
K. Fujikura;M. Hertzberg;E. D. Schiappacasse;Masahide Yamaguchi
中科院分区：
文献类型：
--
作者：
K. Fujikura;M. Hertzberg;E. D. Schiappacasse;Masahide Yamaguchi
一小部分轻标量暗物质，特别是轴子，可能会组织成玻色-爱因斯坦凝聚体，在引力作用下形成团块，称为玻色子星，并在今天的银河晕中大量存在。我们计算了由普通QCD轴子和类轴子粒子组成的团簇的引力微透镜事件的预期数目，并从EROS-2观测和Subaru Hyper SuPrime-Cam观测中得出了微透镜约束条件。我们进行了详细的透镜计算，在我们的分析中包括有限透镜和光源尺寸的影响。我们用暗物质塌缩成团的分数、单个团的密度和轴子的自耦合来约束轴子的质量。我们还考虑并约束了由具有排斥自相互作用的普通标量候选暗物质组成的团块。我们的分析为暗物质的潜在发现打开了一扇新的窗口。
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 axion-like-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.