Ultra-High Energy Neutrino Fluxes: New Constraints and Implications
arXiv:hep-ph/0309328 · doi:10.1088/1475-7516/2004/04/003
Abstract
We apply new upper limits on neutrino fluxes and the diffuse extragalactic component of the GeV gamma-ray flux to various scenarios for ultra high energy cosmic rays and neutrinos. As a result we find that extra-galactic top-down sources can not contribute significantly to the observed flux of highest energy cosmic rays. The Z-burst mechanism where ultra-high energy neutrinos produce cosmic rays via interactions with relic neutrinos is practically ruled out if cosmological limits on neutrino mass and clustering apply.
10 revtex pages, 9 postscript figures