Neutrino Mass, Dark Matter and Baryon Asymmetry without Lepton Number Violation

Understand

We propose a model to explain tiny masses of neutrinos with the 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 lightest $Z_2$-odd particle).
• In this model, $Z_2$-odd particles play an important role to generate the mass of neutrinos.
• The scalar dark matter in our model can satisfy constraints on the dark matter abundance and those from direct searches.