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순수물리이론 연구단
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Peccei-Quinn relaxion

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Title
Peccei-Quinn relaxion
Author(s)
Kwang Sik Jeong; Chang Sub Shin
Publication Date
2018-01
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2018, no.1, pp.121 -
Publisher
SPRINGER
Abstract
The relaxation mechanism, which solves the electroweak hierarchy problem without relying on TeV scale new physics, crucially depends on how a Higgs-dependent back-reaction potential is generated. In this paper, we suggest a new scenario in which the scalar potential induced by the QCD anomaly is responsible both for the relaxation mechanism and the Peccei-Quinn mechanism to solve the strong CP problem. The key idea is to introduce the relaxion and the QCD axion whose cosmic evolutions become quite different depending on an inflaton-dependent scalar potential. Our scheme raises the cutoff scale of the Higgs mass up to 107 GeV, and allows reheating temperature higher than the electroweak scale as would be required for viable cosmology. In addition, the QCD axion can account for the observed dark matter of the universe as produced by the conventional misalignment mechanism. We also consider the possibility that the couplings of the Standard Model depend on the inflaton and become stronger during inflation. In this case, the relaxation can be implemented with a sub-Planckian field excursion of the relaxion for a cutoff scale below 10 TeV. © 2018, The Author(s)
URI
http://pr.ibs.re.kr/handle/8788114/4386
DOI
10.1007/JHEP01(2018)121
ISSN
1029-8479
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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