QCD axion window and low-scale inflation
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PhysRevD.98.015042.pdf
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301.36 KB
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Author(s)
Yin, Wen
Takahashi, Fuminobu
Guth, Alan
Date Issued
July 2018
Journal
Physical Review D
Publisher
American Physical Society
Citation
Takahashi, Fuminobu et al. "QCD axion window and low-scale inflation." Physical Review D 98, 1 (July 2018): 015042
Version
Final published version
Abstract
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. The distribution is peaked at the strong CP conserving minimum if there is no other light degree of freedom contributing to the strong CP phase. As a result, the axion overproduction problem is significantly relaxed even for an axion decay constant larger than 10¹² GeV. We also provide concrete hilltop inflation models where the Hubble parameter during inflation is comparable to or much smaller than the QCD scale, with successful reheating taking place via perturbative decays or dissipation processes.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.98.015042
