Longevity and Highest-Energy Cosmic Rays
Abstract
It is proposed that the highest energy 1020eV cosmic ray primaries are protons, decay products of a long-lived progenitor which has propagated from typically 100Mpc. Such a scenario can occur in e.g. SU(15) grand unification and in some preon models, but is more generic; if true, these unusual cosmic rays provide a window into new physics.
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