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arXiv:1805.08763 [hep-ph]AbstractReferencesReviewsResources

The QCD Axion Window and Low Scale Inflation

Alan H. Guth, Fuminobu Takahashi, Wen Yin

Published 2018-05-22Version 1

We show that the upper bound of the classical QCD axion window can be significantly relaxed for low-scale inflation. If the Gibbons-Hawking temperature during inflation is lower than the QCD scale, the initial QCD axion misalignment angle follows the Bunch-Davies distribution. As a result, the axion overproduce problem is significantly relaxed even for the axion decay constant larger than $10^{12}$ GeV. We give concrete hilltop inflation models where the Hubble parameter during inflation is comparable to or much smaller than the QCD scale and the successful reheating takes place via perturbative decays or dissipation processes.

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