Suppressing the QCD axion abundance by hidden monopoles

被引：50
|
作者：
Kawasaki, Masahiro [1 ,2 ]
Takahashi, Fuminobu [2 ,3 ]
Yamada, Masaki [1 ,2 ,4 ]
机构：
[1] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan
[2] Univ Tokyo, UTIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan
[3] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
[4] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany
来源：
PHYSICS LETTERS B | 2016年 / 753卷
关键词：
CP CONSERVATION; DOMAIN-WALLS; INFLATION; COSMOLOGY; STRINGS;
D O I：
10.1016/j.physletb.2015.12.075
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the Witten effect of hidden monopoles on the QCD axion dynamics, and show that its abundance as well as isocurvature perturbations can be significantly suppressed if there is a sufficient amount of hidden monopoles. When the hidden monopoles make up a significant fraction of dark matter, the Witten effect suppresses the abundance of axion with the decay constant smaller than 10(12) GeV. The cosmological domain wall problem of the QCD axion can also be avoided, relaxing the upper bound on the decay constant when the Peccei-Quinn symmetry is spontaneously broken after inflation. (C) 2016 The Authors. Published by Elsevier B.V.
引用
收藏
页码：677 / 681
页数：5
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