Russian Physics Journal

, Volume 59, Issue 11, pp 1852–1856 | Cite as

Creation and Evolution of Particle Number Asymmetry in an Expanding Universe

  • T. MorozumiEmail author
  • K. I. Nagao
  • A. S. Adam
  • H. Takata

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.


particle number generation non-equilibrium field theory model of scalars 


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  1. 1.
    R. Hotta, T. Morozumi, and H. Takata, Phys. Rev., D90, No. 1, 016008 (2014).Google Scholar

Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • T. Morozumi
    • 1
    Email author
  • K. I. Nagao
    • 2
  • A. S. Adam
    • 1
  • H. Takata
    • 3
  1. 1.Graduate School of ScienceCore of Research for Energetic Universe, Hiroshima UniversityHigashihiroshimaJapan
  2. 2.National Institute of Technology, Niihama CollegeNiihamaJapan
  3. 3.Tomsk State Pedagogical UniversityTomskRussia

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