Dark Matter and Baryogenesis from Non-Abelian Gauged Lepton Number
Abstract
A simple model is constructed based on the gauge symmetry SU(3)c × SU(2)L × U(1)Y × SU(2), with only the leptons transforming nontrivially under SU(2). The extended symmetry is broken down to the Standard Model gauge group at TeV-scale energies. We show that this model provides a mechanism for baryogenesis via leptogenesis in which the lepton number asymmetry is generated by SU(2) instantons. The theory also contains a dark matter candidate - the SU(2) partner of the right-handed neutrino.
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