open access

https://hdl.handle.net/2115/71447

Relaxion window

英語

early Universe

2017-09-07

World Scientific Publishing

Modern Physics Letters A

32(27)

1750142

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.

学術雑誌論文

Accepted Manuscript

Electronic version of an article published as Mod. Phys. Lett. A 32(27), 1750142, 2017, DOI:10.1142/S0217732317501425 © copyright World Scientific Publishing Company http://www.worldscientific.com/worldscinet/mpla

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