Ultrahigh energy neutrino physics

Abstract

We discuss a problem concerning the ultrahigh energy neutrino propagation through the Earth. We present calculation of the neutrino-nucleon cross section at high energies, based on the unifed evolution equation at small x. We also show the solution of the transport equation for different neutrino fluxes originating from active galactic nuclei, gamma ray bursts and top-down model.

Comments: Talk given at Cracow Epiphany Conference on neutrinos in physics and astrophysics, 6-9 January 2000, Cracow,Poland; 14 pages, 7 figures