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

J. M. Cline·U. A. Yajnik·S. N. Nayak·M. Rabikumar
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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.

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J. M. Cline, U. A. Yajnik, S. N. Nayak, M. Rabikumar. 2002-07-28. Transient domain walls and lepton asymmetry in the Left-Right symmetric model. https://doi.org/10.1103/physrevd.66.065001

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