IceCube PeV-EeV Neutrinos and Secret Interactions of Neutrinos

We show that the PeV neutrinos detected by IceCube put unique constraints on "secret" interactions of neutrinos with the cosmic neutrino background (C\nuB). The coupling must be g <0.03 for the mediating boson mass m_{X} \lesssim 2 MeV, g/m_{X} < 5 GeV^{-1} for m_{X} \gtrsim 20 MeV, and $g/m_{X} <... Show more