Low Scale String Unification and the Highest Energy Cosmic Rays

Details Low Scale String Unification and the Highest Energy Cosmic Rays Low Scale String Unification and the Highest Energy Cosmic Rays

2002-09-14

arxiv.org/abs/hep-ph/0209162v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LaTeX

Scientific paper

String unification at a scale of a few tens of TeV explains the existence of cosmic ray interactions beyond the Greisen-Zatsepin-Kuzmin (GZK) cutoff. Trans-GZK cosmic rays are neutrinos which can penetrate the cosmic microwave background. In interactions with atmospheric nuclei they have sufficient energy for exciting string modes. We present a model for the description of such interactions and discuss the properties of the resulting extensive air showers. Presently available data on trans-GZK cosmic rays suggest a string scale around 80 TeV.

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