Neutrino conversions in cosmological gamma-ray burst fireballs

Abstract

We study neutrino conversions in a recently envisaged source of high-energy neutrinos (E \geq 10^6 GeV), that is, in the vicinity of cosmological Gamma-Ray Burst fireballs (GRB). We consider the effects of flavor and spin-flavor conversions and point out that in both situations, a some what higher than estimated high energy tau neutrino flux from GRBs is expected in new km^2 surface area under water/ice neutrino telescopes.

Comments: 16 pages, latex, one figure included as an eps file; improved and extended version of hep-ph/9901450 (to appear in Astroparticle Physics)