2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46517We evaluate neutrino-nucleon cross section for energies up to $10^{21} eV$ in light of new information on the small-$x$ behavior of parton distributions. We give predictions for large underground neutrino telescope event rates for ultrahigh-energy neutrinos from Active Galactic Nuclei and from the decay of topological defects formed in the early Universe.Talk presented by I. Sarcevic at Annual Meeting of Division of Particles and Fields of the APS (DPF'96), Minneapolis, MN, August 10-15, 1996, 3 ppHigh Energy Physics - Phenomenologytext