Creation and Evolution of Particle Number Asymmetry in an Expanding Universe
We introduce a model which may generate particle number asymmetry in an expanding Universe. The model includes charge parity (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.
Keywordsparticle number generation non-equilibrium field theory model of scalars
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- 1.R. Hotta, T. Morozumi, and H. Takata, Phys. Rev., D90, No. 1, 016008 (2014).Google Scholar