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Constraints on relaxion windows

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Title
Constraints on relaxion windows
Author(s)
Kiwoon Choi; Sang Hui Im
Publication Date
2016-12
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2016, no.12, pp.093 -
Publisher
SPRINGER
Abstract
We examine the low energy phenomenology of the relaxion solution to the weak scale hierarchy problem. Assuming that the Hubble friction is responsible for a dissipation of the relaxion energy, we identify the cosmological relaxion window which corresponds to the parameter region compatible with a given value of the acceptable number of inflationary e-foldings. We then discuss a variety of observational constraints on the relaxion window, including those from astrophysical and cosmological considerations. We find that majority of the parameter space with a relaxion mass mϕ ≳ 100 eV or a relaxion decay constant f ≲107GeV is excluded by existing constraints. There is an interesting parameter region with mϕ ∼ 0.2 − 10 GeV and f ∼ few − 200 TeV, which is allowed by existing constraints, but can be probed soon by future beam dump experiments such as the SHiP experiment, or by improved EDM experiments. © 2016, The Author(s)
URI
http://pr.ibs.re.kr/handle/8788114/3224
DOI
10.1007/JHEP12(2016)093
ISSN
1029-8479
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
Files in This Item:
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