What Can we learn from Cosmic Rays?
Abstract
Ultra high energy cosmic rays (UHECR) pose a problem either for particle physics or for astrophysics (or for both) by the unexpectedly high number of cosmic ray showers observed with energy above about 5x10^{19}eV, the Greisen-Zatsepin-Kuzmin (GZK) cutoff. Our emphasis is on those possible solutions of the puzzle which assume that ultra high energy neutrinos travel cosmic distances. We present, in detail, a model which is based on a low energy (50 to 100 TeV) transition to a higher than four dimensional string regime. Neutrino-quark cross sections grow exponentially close to the threshold of this new scale because of the fast increase of the density of string states and effectively acquire hadronic strength.
Cite
@article{arxiv.hep-ph/0307098,
title = {What Can we learn from Cosmic Rays?},
author = {S. Kovesi-Domokos and G. Domokos},
journal= {arXiv preprint arXiv:hep-ph/0307098},
year = {2007}
}
Comments
Presented by S. Kovesi-Domokos at the Jophns Hopkins Workshop, "High Eenergy Reactions", Heidelberg 2002