Suppressing the QCD axion abundance by hidden monopoles

Masahiro Kawasaki, Fuminobu Takahashi, Masaki Yamada

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


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 1012GeV. 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.

Original languageEnglish
Pages (from-to)677-681
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2016 Feb 10


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