| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1850719 | Physics Letters B | 2015 | 5 Pages |
Abstract
We propose a QCD axion model where the origin of PQ symmetry and suppression of axion isocurvature perturbations are explained by introducing an extra dimension. Each extra quark–antiquark pair lives on branes separately to suppress PQ breaking operators. The size of the extra dimension changes after inflation due to an interaction between inflaton and a bulk scalar field, which implies that the PQ symmetry can be drastically broken during inflation to suppress undesirable axion isocurvature fluctuations.
Related Topics
Physical Sciences and Engineering
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Authors
Masahiro Kawasaki, Masaki Yamada, Tsutomu T. Yanagida,