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QCD axion window and low-scale inflation
Open accessAbstract
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 $1{0}^{12}\text{ }\text{ }\mathrm{GeV}$. 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.
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Cites
Discovering the QCD axion with black holes and gravitational waves
Arvanitaki, A., Baryakhtar, M., & Huang, X. (2015) · Physical Review D · doi:10.1103/physrevd.91.084011 · Cited by 543
Dimensionless constants, cosmology, and other dark matters
Tegmark, M., Aguirre, A., Rees, M. J., & Wilczek, F. (2006) · Physical Review D · doi:10.1103/physrevd.73.023505 · Cited by 401
Cited by
The landscape of QCD axion models
Di Luzio, L., Giannotti, M., Nardi, E., & Visinelli, L. (2020) · Physics Reports · doi:10.1016/j.physrep.2020.06.002 · Cited by 657
Metadata
- Authors
- Takahashi, F., Yin, W., & Guth, A. H.
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 2018-07-31
- Volume
- 98
- Issue
- 1
- ISSN
- 2470-0010 (ISSN-L)
- 2470-0029
- OpenAlex
- W2804270774
- Cited by
- 161
- References
- 2
- FWCI
- 10.76
- Type
- journal article
- Language
- en
- Open access
- hybrid
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