Baryogenesis Below The Electroweak Scale

TL;DR

This paper proposes a novel baryogenesis mechanism occurring below the electroweak scale, avoiding issues of GUT and electroweak scenarios by leveraging non-thermal sphaleron production during preheating.

Contribution

It introduces a new baryogenesis scenario that operates at low energies and does not require high-temperature reheating, expanding the possibilities for baryon asymmetry generation.

Findings

Avoids GUT baryon production issues

Proposes non-thermal sphaleron generation during preheating

Potentially explains observed baryon asymmetry

Abstract

We propose a new alternative for baryogenesis which resolves a number of the problems associated with GUT and electroweak scenarios, and which may allow baryogenesis even in modest extensions of the standard model. If the universe never reheats above the electroweak scale following inflation, GUT baryon production does not occur and at the same time thermal sphalerons, gravitinos and monopoles are not produced in abundance. Nevertheless, non-thermal production of sphaleron configurations via preheating could generate the observed baryon asymmetry of the universe.