Journal of High Energy Physics

, 2016:93 | Cite as

Constraints on relaxion windows

Open Access
Regular Article - Theoretical Physics

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.

Keywords

Beyond Standard Model Cosmology of Theories beyond the SM Higgs Physics 

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Copyright information

© The Author(s) 2016

Authors and Affiliations

  1. 1.Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS)DaejeonKorea
  2. 2.Bethe Center for Theoretical Physics and Physikalisches Institut der Universität BonnBonnGermany

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