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Suppressing the QCD axion abundance by hidden monopoles

Authors :
Fuminobu Takahashi
Masaki Yamada
Masahiro Kawasaki
Source :
Physics Letters B, Vol 753, Iss C, Pp 677-681 (2016), Physics Letters B, Physics letters / B 753, 677-681 (2016). doi:10.1016/j.physletb.2015.12.075
Publication Year :
2016
Publisher :
Elsevier, 2016.

Abstract

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.<br />Comment: 6 pages, 1 figure

Details

Language :
English
ISSN :
18732445 and 03702693
Volume :
753
Database :
OpenAIRE
Journal :
Physics Letters B
Accession number :
edsair.doi.dedup.....f3e7a783b6582dde8206f28b58db9213
Full Text :
https://doi.org/10.1016/j.physletb.2015.12.075