Tracing very high energy neutrinos from cosmological distances in ice

Abstract

Astrophysical sources of ultrahigh energy neutrinos yield tau neutrino fluxes due to neutrino oscillations. We study in detail the contribution of tau neutrinos with energies above ${10}^{6}\mathrm{GeV}$ relative to the contribution of the other flavors. We consider several different initial neutrino fluxes and include tau neutrino regeneration in transit through the Earth and the energy loss of charged leptons. We discuss the signals of tau neutrinos in detectors such as IceCube, RICE, and ANITA.