Orateur
Aleksandr Chatrchyan
(DESY)
Description
Cosmological relaxation of the electroweak scale provides an elegant solution to the Higgs mass hierarchy problem. In the simplest model, the Higgs mass is scanned during inflation by another scalar field, the relaxion, whose slow-roll dynamics selects a naturally small Higgs vev. In this work we investigate the mechanism in a less conventional regime where the relaxion is subject to large fluctuations during its dynamics. We identify modified stopping conditions for such dynamics of the relaxion and find the new parameter space. In a certain region of the parameter space, the relaxion can naturally account for the observed dark ma er density in the universe.
