Strongly Interacting Neutrinos and the Highest Energy Cosmic Rays

Abstract
Cosmic rays of energies larger than the Greisen-Zatsepin-Kuzmin cutoff may be neutrinos if they acquire strong interactions due to a “precocious unification” of forces. A scenario for this to happen is outlined. There is no contradiction with precision measurements carried out at LEP and SLAC. Observable consequences at LHC and future neutrino detectors are discussed.