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Relaxion window

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Title: Relaxion window
Authors: Kobayashi, Tatsuo Browse this author →KAKEN DB
Seto, Osamu Browse this author →KAKEN DB
Shimomura, Takashi Browse this author
Urakawa, Yuko Browse this author
Keywords: Relaxion
phenomenological constraints
early Universe
Issue Date: 7-Sep-2017
Publisher: World Scientific Publishing
Journal Title: Modern Physics Letters A
Volume: 32
Issue: 27
Start Page: 1750142
Publisher DOI: 10.1142/S0217732317501425
Abstract: We investigate cosmological constraints on the original relaxion scenario proposed by Graham, Kaplan and Rajendran. We first discuss the appropriate sign choice of the terms in the scalar potential, when the QCD axion is the relaxion with a relaxion-inflaton coupling proposed in the original paper. We next derive the cosmologically consistent ranges of the mass and a coupling of the relaxion for both the QCD relaxion and non-QCD relaxion. The mass range is obtained by 10(-5) eV << m(phi) less than or similar to 10(4) eV. We also find that a strong correlation between the Hubble parameter at the relaxion stabilization and the scale A of non-QCD strong dynamics, which generates the non-perturbative relaxion cosine potential. For a higher relaxion mass, a large scale A becomes available. However, for its lower mass, A should be small and constructing such a particle physics model is challenging.
Rights: Electronic version of an article published as Mod. Phys. Lett. A 32(27), 1750142, 2017, DOI:10.1142/S0217732317501425 © copyright World Scientific Publishing Company
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小林 達夫

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