Creation and evolution of particle numberasymmetry in an expanding universe

TL;DR

This paper presents a model for generating and evolving particle number asymmetry in an expanding universe, incorporating CP violation and particle number violation, using non-equilibrium quantum field theory.

Contribution

It introduces a new model combining scalar fields with CP and particle number violation to explain asymmetry creation in cosmology.

Findings

Asymmetry is generated through interactions in the model.

The evolution of asymmetry is computed in a flat universe limit.

The model demonstrates how initial conditions influence asymmetry development.

Abstract

We introduce a model which may generate particle number asymmetry in an expanding Universe. The model includes CP violating and particle number violating interactions. The model consists of a real scalar field and a complex scalar field. Starting with an initial condition specified by a density matrix, we show how the asymmetry is created through the interaction and how it evolves at later time. We compute the asymmetry using non-equilibrium quantum field theory and as a first test of the model, we study how the asymmetry evolves in the flat limit.