Grand unified theories, topological defects, and ultrahigh-energy cosmic rays

Details Grand unified theories, topological defects, and ultrahigh-energy cosmic rays Grand unified theories, topological defects, and ultrahigh-energy cosmic rays

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvl..69..567b&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 69, no. 4, July 27, 1992, p. 567-570. Previously announced in STAR as N92-18273.

Physics

189

Annihilation Reactions, Broken Symmetry, Cosmic Rays, Energy Spectra, Grand Unified Theory, Neutrinos, Particle Energy, Proton Energy, Fragmentation, Hadrons, Theoretical Physics

Scientific paper

The ultrahigh-energy (UHE) proton and neutrino spectra resulting from collapse or annihilations of topological defects surviving from the GUT era are calculated. Irrespective of the specific process under consideration (which determines the overall normalization of the spectrum), the UHE proton spectrum always 'recovers' at approximately 1.8 x 10 exp 11 GeV after a partial Greisen-Zatsepin-Kuz'min 'cutoff' at approximately 5 x 10 exp 10 GeV and continues to a GUT-scale energy with a universal shape determined by the physics of hadronic jet fragmentation. Implications of the results are discussed.

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