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

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

2002-04-27

arxiv.org/abs/hep-ph/0204319v2

Phys.Rev. D66 (2002) 065001

Physics

High Energy Physics

High Energy Physics - Phenomenology

v2 version accepted for publication in Phys. Rev. D. Discussion in Introduction and Conclusion sharpened. Equation (12) correc

Scientific paper

10.1103/PhysRevD.66.065001

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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