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.
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Domokos et al. (1999) studied this question.
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