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Leptogenesis with dirac neutrinos

Dick1, Lindner, Ratz

  • 1Physik Department, Technische Universitat Munchen, D-85748 Garching, Germany and and Max Planck Institut fur Physik, D-80805 Munchen, Germany.

Physical Review Letters
|September 16, 2000
PubMed
Summary

A novel neutrinogenesis mechanism explains the Universe's baryon asymmetry using right-handed neutrinos and sphaleron processes. This model aligns with current neutrino mass experimental constraints.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astroparticle Physics

Background:

  • The origin of the Universe's baryon asymmetry (excess of matter over antimatter) is a fundamental unsolved problem.
  • Existing models often require specific initial conditions or new physics beyond the Standard Model.

Purpose of the Study:

  • To propose and explore a new mechanism for generating the baryon asymmetry of the Universe (BAU).
  • To investigate the role of right-handed neutrinos and sphaleron processes in baryogenesis.
  • To demonstrate consistency with current experimental constraints on neutrino masses.

Main Methods:

  • Theoretical modeling of particle interactions in the early Universe.
  • Analysis of (B+L)-violating sphaleron processes in the presence of right-handed neutrinos.
  • Development of a simplified toy model to illustrate the proposed mechanism.

Main Results:

  • A "neutrinogenesis" mechanism is described where (B+L)-violating sphaleron processes generate baryon asymmetry.
  • This mechanism operates effectively even with initially vanishing B and L (baryon and lepton numbers).
  • The required neutrino mass constraints are compatible with experimentally suggested values.

Conclusions:

  • The proposed neutrinogenesis mechanism offers a viable pathway to explain the observed baryon asymmetry.
  • The model provides a compelling link between neutrino physics and early Universe cosmology.
  • Further theoretical and experimental investigations are warranted to validate this mechanism.

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