Warm baryogenesis

TL;DR

This paper proposes a warm inflation-based mechanism for baryogenesis that naturally suppresses unwanted relics and predicts observable baryon isocurvature perturbations, offering a testable alternative to traditional GUT models.

Contribution

It introduces a supersymmetric two-stage process during warm inflation that generates baryon asymmetry without producing dangerous relics, differing from thermal GUT baryogenesis.

Findings

Baryon asymmetry close to observed value can be naturally produced.

Temperature remains below heavy mass threshold during inflation, suppressing unwanted corrections.

Predicts baryon isocurvature perturbations within future experimental detection range.

Abstract

We show that a baryon asymmetry can be generated by dissipative effects during warm inflation via a supersymmetric two-stage mechanism, where the inflaton is coupled to heavy mediator fields that then decay into light species through B- and CP-violating interactions. In contrast with thermal GUT baryogenesis models, the temperature during inflation is always below the heavy mass threshold, simultaneously suppressing thermal and quantum corrections to the inflaton potential and the production of dangerous GUT relics. This naturally gives a small baryon asymmetry close to the observed value, although parametrically larger values may be diluted after inflation along with any gravitino overabundance. Furthermore, this process yields baryon isocurvature perturbations within the range of future experiments, making this an attractive and testable model of GUT baryogenesis.