New mechanism for primordial black hole formation from the QCD axion

被引:8
作者
Ge, Shuailiang [1 ,2 ,3 ]
Guo, Jinhui [2 ,3 ]
Liu, Jia [1 ,2 ,3 ]
机构
[1] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
[3] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
基金
中国国家自然科学基金;
关键词
CP CONSERVATION; CONSTRAINTS; INVARIANCE;
D O I
10.1103/PhysRevD.109.123030
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new mechanism for the primordial black hole (PBH) production within the QCD axion framework. We take the case where the Peccei-Quinn symmetry breaks during inflation, resulting in a N DW = 1 string-wall network that reenters the horizon sufficiently late. Therefore, closed axion domain walls naturally arising in the network are sufficiently large to collapse into PBHs. Our numerical simulation shows that similar to 0 .3% of the total wall area is in the form of closed walls. In addition, the relic abundance of dark matter is dominantly accounted for by free axions from the collapse of open walls bounded by strings. In this framework, the abundance of PBH within dark matter is calculated to be similar to 0 .9% . This fraction remains unaffected by axion parameters or the reentering horizon temperature, as it is determined by the fixed proportion of closed walls in the network, governed by the principles of percolation theory. The resultant PBHs uniformly share the same mass, which spans from about 10 - 9 to 1 solar mass, corresponding to the classical QCD axion mass window 10 - 5 -10 - 2 eV and the reentering horizon temperature 300 - 1 MeV. Intriguingly, PBHs in this mechanism can naturally account for the ultrashorttimescale events observed the OGLE collaboration.
引用
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页数:10
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