Kavli Affiliate: Hitoshi Murayama
| First 5 Authors: Dan Kondo, Dan Kondo, , ,
| Summary:
Many models of dark matter QCD axion requires inflation at a scale
$H_textinf lesssim 10^6$~GeV and hence does not allow for a detectable
tensor mode fluctuation. This is because the domain wall problem forces the
Peccei–Quinn symmetry to be broken during the inflation and the axions to be
produced by the misalignment mechanism. We point out that theories with
multiple axions can evade this constraint and allow for a high-scale inflation
with detectable tensor mode. It only requires a condition on the anomaly
coefficients so that there is a unique minimum for the axion potential without
a fine-tuning or small parameters.
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