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Relaxion window

Tatsuo Kobayashi
(
- Hokkaido U.
)
,
Osamu Seto
(
- Hokkai-Gakuen U. and
- Hokkaido U.
)
,
Takashi Shimomura
(
- Miyazaki U.
)
,
Yuko Urakawa
(
- Nagoya U.
)

May 23, 2016

13 pages

Published in:

Mod.Phys.Lett.A 32 (2017) 27, 1750142

Published: Aug 11, 2017

e-Print:

1605.06908 [astro-ph.CO]

DOI:

10.1142/S0217732317501425

Report number:

EPHOU-16-007,
HGU-CAP-041,
UME-PP-004

View in:

ADS Abstract Service

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Abstract: (WSP)

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 10−5eV ≪ m ϕ ≲ 104eV. We also find that a strong correlation between the Hubble parameter at the relaxion stabilization and the scale Λ of non-QCD strong dynamics, which generates the non-perturbative relaxion cosine potential. For a higher relaxion mass, a large scale Λ becomes available. However, for its lower mass, Λ should be small and constructing such a particle physics model is challenging.

Note:

14 pages, 3 figures, discussion added, the final journal version

03.50.Kk
14.80.Va
98.80.Cq
Relaxion
phenomenological constraints
early Universe
electroweak interaction: symmetry breaking
quantum chromodynamics: axion
Hubble constant
nonperturbative

References(32)

Figures(3)

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