Cosmological relaxation and high scale inflation

Tetsutaro Higaki, Naoyuki Takeda, and Yusuke Yamada
Phys. Rev. D 95, 015009 – Published 12 January 2017

Abstract

The relaxion mechanism elegantly solves the Higgs hierarchy problem, but it requires that the early Universe experiences a long inflation phase with a small energy scale since the settle down of the relaxion needs to take place during inflation. In this paper, unlike the original one, we consider another scenario in which the Higgs vacuum expectation value is determined after inflation. To accomplish the mechanism, we take into account the effects of the Hubble-induced mass and thermal one in the dynamics of the relaxion. Then, we find that for the relaxion mechanism the coupling of the relaxion with the additional mass terms should be large.

  • Received 2 November 2016

DOI:https://doi.org/10.1103/PhysRevD.95.015009

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsParticles & Fields

Authors & Affiliations

Tetsutaro Higaki*, Naoyuki Takeda, and Yusuke Yamada

  • Department of Physics, Keio University, Kanagawa 223-8522, Japan and Research and Education Center for Natural Sciences, Keio University, Kanagawa 223-8521, Japan

  • *thigaki@rk.phys.keio.ac.jp
  • takedan@keio.jp
  • yusuke-yamada@keio.jp

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Issue

Vol. 95, Iss. 1 — 1 January 2017

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