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Neutrino mass without lepton number violation, dark matter; and a strongly first-order phase transition

Neutrino mass without lepton number violation, dark matter; and a strongly first-order phase transition

We propose a model to explain the tiny masses of neutrinos with lepton number conservation, where neither too heavy particles beyond the TeV-scale nor tiny coupling constants are required. Assignments of conserving lepton numbers to new fields result in an unbroken ${Z}_{2}$ symmetry that stabilizes the dark matter candidate (the …