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Coherent baryogenesis.

Björn Garbrecht1, Tomislav Prokopec, Michael G Schmidt

  • 1Institut für Theoretische Physik, Heidelberg University, Philosophenweg 16, D-69120 Heidelberg, Germany. B.Garbrecht@thphys.uni-heidelberg.de

Physical Review Letters
|March 5, 2004
PubMed
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This study introduces a novel baryogenesis mechanism involving the coherent production and mixing of fermionic species during phase transitions. The model explains the observed baryon asymmetry in the universe through specific conditions on fermion mass matrices.

Area of Science:

  • Particle Physics
  • Cosmology
  • Baryogenesis

Background:

  • The origin of the baryon asymmetry in the universe remains a fundamental unsolved problem in physics.
  • Existing baryogenesis models often rely on specific particle content and interactions.
  • Phase transitions in the early universe are crucial epochs for generating cosmological asymmetries.

Purpose of the Study:

  • To propose a new baryogenesis scenario based on coherent production and mixing of fermionic species.
  • To explore the conditions under which efficient baryon production can occur.
  • To investigate the viability of this mechanism within a hybrid inflationary framework and a supersymmetric Pati-Salam Grand Unified Theory (GUT).

Main Methods:

  • Development of a theoretical model involving coherent production and mixing of fermions.

Related Experiment Videos

  • Analysis of fermion mass generation via Yukawa couplings to scalar fields during phase transitions.
  • Investigation of conditions for efficient baryon production, including nonadiabatic variation, asymmetry of the mass matrix, and violation of CP and B-L charges.
  • Application to a toy model with two mixing fermionic species.
  • Embedding the scenario within a hybrid inflationary model and a supersymmetric Pati-Salam GUT.

    • Main Results:

    • The proposed baryogenesis mechanism is operative during cosmological phase transitions.
    • Efficient baryon production is achieved when the fermion mass matrix is nonadiabatically varying, nonsymmetric, and violates CP and B-L (or related) charges.
    • A toy model demonstrates the feasibility of the mechanism.
    • The scenario is successfully embedded in a hybrid inflationary model within a supersymmetric Pati-Salam GUT.
    • The model generically produces a baryon excess consistent with observational data.

    Conclusions:

    • The novel baryogenesis scenario provides a viable explanation for the observed baryon asymmetry.
    • The mechanism's efficiency is tied to specific properties of the fermion mass matrix during phase transitions.
    • The successful embedding in a supersymmetric Pati-Salam GUT suggests potential connections to Grand Unification.