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arXiv · 1610.05738

Heavy right-handed neutrino dark matter in left-right models

P. S. Bhupal Dev·Rabindra N. Mohapatra·Yongchao Zhang
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Abstract

We show that in a class of non-supersymmetric left-right extensions of the Standard Model (SM), the lightest right-handed neutrino (RHN) can play the role of thermal Dark Matter (DM) in the Universe for a wide mass range from TeV to PeV. Our model is based on the gauge group $SU(3)_c \times SU(2)_L\times SU(2)_R\times U(1)_{Y_L}\times U(1)_{Y_R}$ in which a heavy copy of the SM fermions are introduced and the stability of the RHN DM is guaranteed by an automatic $Z_2$ symmetry present in the leptonic sector. In such models the active neutrino masses are obtained via the type-II seesaw mechanism. We find a lower bound on the RHN DM mass of order TeV from relic density constraints, as well as an unitarity upper bound in the multi-TeV to PeV scale, depending on the entropy dilution factor. The RHN DM could be made long-lived by soft-breaking of the $Z_2$ symmetry and provides a concrete example of decaying DM interpretation of the PeV neutrinos observed at IceCube.

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P. S. Bhupal Dev, Rabindra N. Mohapatra, Yongchao Zhang. 2016-10-18. Heavy right-handed neutrino dark matter in left-right models. https://doi.org/10.1142/s0217732317400077

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