期刊
PHYSICS LETTERS B
卷 753, 期 -, 页码 677-681出版社
ELSEVIER
DOI: 10.1016/j.physletb.2015.12.075
关键词
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资金
- MEXT KAKENHI [15H05889, 23104008]
- JSPS KAKENHI [25400248, 24740135, 26247042, 26287039]
- JSPS Research Fellowships for Young Scientists [25.8715]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Program for the Leading Graduate Schools, MEXT, Japan
- Grants-in-Aid for Scientific Research [13J08715, 15H05889, 26247042, 24740135] Funding Source: KAKEN
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.
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