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

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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.