Axion star condensation around primordial black holes and microlensing limits

被引：2

作者：

Yin, Ziwen ^{[1
]}

Visinelli, Luca ^{[2
]}

机构：

[1] Tsung Dao Lee Inst TDLI, Astron Div, 1 Lisuo Rd, Shanghai 201210, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Phys & Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2024年 / 10期

基金：

中国国家自然科学基金;

关键词：

axions; dark matter theory; HALO; SYSTEMS; LENSES;

D O I：

10.1088/1475-7516/2024/10/013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present novel findings concerning the parameter space of axion stars, extended emphasize their formation within the dense minihalos that potentially surround primordial black holes and in axion miniclusters. Our study investigates the relation between the radius and mass of an axion star in these dense surroundings, revealing distinct morphological characteristics compared to isolated scenarios. We explore the implications of these results when applied to the bound state between a primordial black hole and an axion star and the gravitational microlensing from extended objects, leading to insights on the observational constraints from such "halo" axion stars. We provide a constraint on the fraction of the galactic population of axion stars from their contribution to the microlensing events from the EROS-2 survey, using the numerical resolution of the Schr & ouml;dinger-Poisson equation.

引用

页数：29

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