Ultra-high energy cosmic neutrinos

Abstract

Several cosmologically distant astrophysical sources may produce ultra-high energy cosmic neutrinos (E > 10^6 GeV) of all flavors above the atmospheric neutrino background. I study the effects of vacuum neutrino flavor mixing on this cosmic neutrino flux. Prospects for observations of these ultra-high energy cosmic neutrinos in large underwater/ice neutrino telescopes are also briefly discussed.Comment: 3 pages, latex, talk given at the 8th Asia Pacific Physics Conference (APPC2000), 7-10 August, 2000, Taipei, Taiwan (to appear in its proceedings