PeV Scale Right Handed Neutrino Dark Matter in $S_4$ Flavor Symmetric extra U(1) model

Understand

Recent observation of high energy neutrino in IceCube experiment suggests existence of superheavy dark matter beyond PeV.

• We identify the parent particles of neutrino as two degenerated right handed neutrinos, assuming the dark matter is the heaviest right handed neutrino.
• The $O(V_{cb})\sim O(10^{-2})$ flavor symmetry breaking accounts for the $O(10^{-4})$ mass degeneracy of right handed neutrinos which is a sizable scale to explain the successful resonant leptogenesis at the PeV scale.
• At the same time, non-thermal production of the heaviest right handed neutrino gives the right amount of dark matter for $T_{RH}\sim 10$PeV.