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Highest Energy Cosmic Rays

Paul H. Frampton
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Abstract

It is proposed that the highest energy $\sim 10^{20}$eV cosmic ray primaries are protons, decay products of a long-lived progenitor whose high kinetic energy arises from decay of a distant (cosmological) superheavy particle, G. 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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Paul H. Frampton. 1998-04-22. Highest Energy Cosmic Rays. https://arxiv.org/abs/astro-ph/9804219

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