Flux-Induced Baryon Asymmetry

TL;DR

This paper proposes a novel mechanism for the universe's baryon asymmetry, induced by a non-zero antisymmetric field background in string-inspired models, avoiding Sakharov conditions.

Contribution

It introduces a new baryogenesis scenario based on antisymmetric field backgrounds in D-brane models, bypassing traditional Sakharov conditions.

Findings

Baryon asymmetry can be generated without Sakharov conditions.

Antisymmetric field backgrounds induce (B-L) number density.

D-brane models naturally incorporate the necessary ingredients.

Abstract

I propose that the primordial baryon asymmetry of the universe was induced by the presence of a non-vanishing antisymmetric field background H_ijk across the three space dimensions. This background creates a dilute (B-L)-number density in the universe cancelling the contribution from baryons and leptons. This situation naturally appears if the U(1)_{B-L} symmetry is gauged and the corresponding gauge boson gets a Stuckelberg mass by combining with an antisymmetric field B_ij. All these ingredients are present in D-brane models of particle physics. None of the Sakharov conditions are required.