Cosmological relaxation and high scale inflation

TL;DR

This paper investigates whether the relaxion mechanism can address the Higgs hierarchy problem during high scale inflation or reheating, considering Hubble-induced mass and thermal effects on relaxion dynamics.

Contribution

It analyzes the viability of the relaxion mechanism in high-scale inflation scenarios with detailed effects of Hubble and thermal masses.

Findings

Relaxion mechanism can potentially solve the hierarchy problem during high-scale inflation.

Hubble-induced mass effects significantly influence relaxion dynamics.

Thermal effects also impact the relaxion's ability to set the Higgs VEV.

Abstract

We study whether the relaxion mechanism solves the Higgs hierarchy problem against a high scale inflation or a high reheating temperature. To accomplish the mechanism, we consider the scenario that the Higgs vacuum expectation value is determined after inflation. We take into account the effects of the Hubble induced mass and thermal one in the dynamics of the relaxion.