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astro-ph1999
Ultra High Energy Cosmic Ray Accelerators
Angela V. Olinto
The surprising lack of a high energy cutoff in the cosmic ray spectrum at the highest energies together with an apparently isotropic distribution of arrival directions have strongl…
astro-ph1999
Galactic Ultra-High-Energy Cosmic Rays
A. V. Olinto, R. I. Epstein, P. Blasi
The absence of the expected GZK cutoff strongly challenges the notion that the highest-energy cosmic rays are of distant extragalactic origin. We discuss the possibility that these…