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Title: QCD axion window and low-scale inflation

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 10 12 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.

Authors:
; ;
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1462288
Alternate Identifier(s):
OSTI ID: 1501439
Grant/Contract Number:  
[SC0012567]
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
[Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 1]; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Takahashi, Fuminobu, Yin, Wen, and Guth, Alan H. QCD axion window and low-scale inflation. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.015042.
Takahashi, Fuminobu, Yin, Wen, & Guth, Alan H. QCD axion window and low-scale inflation. United States. doi:10.1103/PhysRevD.98.015042.
Takahashi, Fuminobu, Yin, Wen, and Guth, Alan H. Tue . "QCD axion window and low-scale inflation". United States. doi:10.1103/PhysRevD.98.015042.
@article{osti_1462288,
title = {QCD axion window and low-scale inflation},
author = {Takahashi, Fuminobu and Yin, Wen and Guth, Alan H.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.98.015042},
journal = {Physical Review D},
number = [1],
volume = [98],
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.015042

Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1. FIG. 1. : The relaxed QCD axion window as a function of the inflation scale. Numerical results are shown by symbols for the fine-tuning parameter, ϵ = 1, 0.126, 0.0125, and 0.00125 from left to right. The vertical lines correspond to the upper bounds of the ordinary axion window formore » θ* = 1, 0.1, 0.01, and 0.001 from left to right. The region above each line is excluded because the axion abundance exceeds the observed dark matter abundance.« less

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    Works referencing / citing this record:

    Physics potential of the International Axion Observatory (IAXO)
    journal, June 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.