Violation of C/CP Symmetry Induced by a Scalar Field Emerging from a Two-Brane Universe: A Gateway to Baryogenesis

TL;DR

This paper proposes a baryogenesis model involving a scalar field from a two-brane universe that breaks C/CP symmetry, providing a novel mechanism for matter-antimatter asymmetry with potential observational implications.

Contribution

It introduces a new baryogenesis mechanism driven by a scalar field from a two-brane universe, extending electromagnetic gauge symmetry and breaking C/CP invariance.

Findings

Baryogenesis occurs after the quark-gluon era due to brane interactions.

The model predicts observable consequences of symmetry breaking.

Leptogenesis is also addressed within this framework.

Abstract

A model of baryogenesis is introduced where our usual visible Universe is a 3-brane coevolving with a hidden 3-brane in a multidimensional bulk. The visible matter and antimatter sectors are naturally coupled with the hidden matter and antimatter sectors, breaking the C/CP invariance and leading to baryogenesis occurring after the quark-gluon era. The issue of leptogenesis is also discussed. The symmetry breaking spontaneously occurs due to the presence of an extra scalar field supported by the $U(1)\otimes U(1)$ gauge group, which extends the conventional electromagnetic gauge field in the two-brane universe. Observational consequences are discussed.