Work

Fast-rolling relaxion

Year: 2019

Type: article

Abstract: We discuss new mechanisms to stop the relaxion field during inflation. They can be realized in a generic model, including the original model but in a quite different parameter region. We consider a fast-rolling relaxion field, which can go over the bumps created by QCD-like dynamics. Then, in one of the mechanisms, we stop it with a parametric resonance of the Higgs field. The mechanisms are free from a super-Planckian field excursion or a gigantic number of e-folds of inflation. The relaxion has a mass around the weak scale and mixes with the Higgs boson, which enhances the testability of our mechanisms.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep11(2019)140

Authors: Masahiro Ibe, Yutaro Shoji, Motoo Suzuki

Institutions: Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Nagoya University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: Ministry of Education, Culture, Sports, Science and Technology, University of California, Irvine, Japan Society for the Promotion of Science