QCD axion window and low-scale inflation

Takahashi, Fuminobu; Yin, Wen; Guth, Alan H.

doi:10.1103/physrevd.98.015042

Title: QCD axion window and low-scale inflation

Journal Article · 31 July 2018 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.98.015042 · OSTI ID:1462288

Takahashi, Fuminobu ^[1]; Yin, Wen ^[2]; Guth, Alan H. ^[3]

Tohoku Univ., Sendai, Miyagi (Japan); Univ. of Tokyo, Kashiwa, (Japan); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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 . Furthermore, we 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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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0012567

OSTI ID:: 1462288

Alternate ID(s):: OSTI ID: 1501439

Journal Information:: Physical Review. D., Vol. 98, Issue 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 101 works

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