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.
Keywords
Cite
@article{arxiv.hep-ph/0204319,
title = {Transient domain walls and lepton asymmetry in the Left-Right symmetric model},
author = {J. M. Cline and U. A. Yajnik and S. N. Nayak and M. Rabikumar},
journal= {arXiv preprint arXiv:hep-ph/0204319},
year = {2009}
}
Comments
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