Journal
PHYSICS LETTERS B
Volume 734, Issue -, Pages 21-26Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2014.05.014
Keywords
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Funding
- Inoue Foundation for Science
- World Premier International Center Initiative (WPI Program), MEXT, Japan
- [24111702]
- [21111006]
- [23104008]
- [22244030]
- [21244033]
- [24740135]
- [25800169]
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The BICEP2 experiment determined the Hubble parameter during inflation to be about 1014 GeV. Such high inflation scale is in tension with the QCD axion dark matter if the Peccei-Quinn (PQ) symmetry remains broken during and after inflation, because too large axion isocurvature perturbations would be generated. The axion isocurvature perturbations can be suppressed if the axion acquires a sufficiently heavy mass during inflation. We show that this is realized if the PQ symmetry is explicitly broken down to a discrete symmetry and if the breaking is enhanced during inflation. We also show that, even when the PQ symmetry becomes spontaneously broken after inflation, such a temporarily enhanced PQ symmetry breaking relaxes the constraint on the axion decay constant. (C) 2014 The Authors. Published by Elsevier B.V.
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