Transient domain walls and lepton asymmetry in the Left-Right symmetric model

Abstract

It is shown that the dynamics of domain walls in Left-Right symmetric models, separating respective regions of unbroken SU(2)_L and SU(2)_R in the early universe, can give rise to baryogenesis via leptogenesis. Neutrinos have a spatially varying complex mass matrix due to CP-violating scalar condensates in the domain wall. The motion of the wall through the plasma generates a flux of lepton number across the wall which is converted to a lepton asymmetry by helicity-flipping scatterings. Subsequent processing of the lepton excess by sphalerons results in the observed baryon asymmetry, for a range of parameters in Left-Right symmetric models.

v2 version accepted for publication in Phys. Rev. D. Discussion in Introduction and Conclusion sharpened. Equation (12) corrected. 16 pages, 3 figure files, RevTeX4 style

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• Leptogenesis bound on neutrino masses in left-right symmetric models with spontaneous D-parity violation
• Spontaneously broken parity and consistent cosmology with transitory domain walls
• PeV scale Left-Right symmetry and baryon asymmetry of the Universe
• Left-Right Symmetry Breaking and Gravitational Waves : A Tale of Two Phase Transitions
• Cosmology in a supersymmetric model with gauged $B-L$
• Domain walls and CP violation with left right supersymmetry:implications for leptogenesis and electron EDM
• Gauge mediated supersymmetry breaking and the cosmology of Left-Right symmetric model
• Why PeV scale left-right symmetry is a good thing