Speaker
Description
Cosmological relaxation of the electroweak scale is improved by using particle production to trap
the relaxion. We combine leptogenesis with such a relaxion model that has no extremely small
parameters or large e-foldings. Scanning happens after inflation now allowed to be at a high
scale over a sub-Planckian relaxion ?field range for an O(100) TeV cut-off? scale of new physics.
Particle production by the relaxion also reheats the universe and generates the baryonic matter-antimatter asymmetry. We propose a realisation in which out-of-equilibrium leptons, produced by
the relaxion, scatter with the thermal bath through interactions that violate CP and lepton number
via higher-dimensional operators. Such a minimal effective ?field theory setup, with no new physics
below the cut-off?, naturally decouples new physics while linking leptogenesis to relaxion particle
production; the baryon asymmetry of the universe can thus be intrinsically tied to a weak scale
hierarchy.
| Affiliation | KAIST |
|---|---|
| Academic position | Post doc |
| Email address | shivaandalice@gmail.com |
