Pseudo-Dirac neutrinos via mirror-world and depletion of UHE neutrinos

Understand

We propose a possible particle physics explanation of the non-observation of muon neutrino events at IceCube coincident with GRB gamma ray at the rates predicted by the standard Bahcall-Waxman model, in terms of neutrino oscillations.

• Our model is based on assuming that (a) all neutrinos are pseudo-Dirac particles and (b) there exists a mirror world interacting gravitationally with the observed world.
• This scenario has three sterile neutrinos associated with each flavour of ordinary neutrinos.
• Very tiny mass splitting between these neutrinos is assumed to arise from lepton number violating dimension five operators suppressed by the Planck scale.