New physics from ultrahigh energy cosmic rays
High Energy Physics - Phenomenology
2011-02-16 v1 Astrophysics
Abstract
Observations of cosmic rays with energies above ~ 4 x 10^{10} GeV have inspired several speculative suggestions concerning their origin. The crucial question is whether or not the spectrum exhibits the expected `GZK cutoff' at this energy -- concerning which there are presently contradictory results. If there is indeed a cutoff, then the sources are cosmologically distant and rather exotic in nature. If there is no cutoff then new physics is required.
Cite
@article{arxiv.hep-ph/0312223,
title = {New physics from ultrahigh energy cosmic rays},
author = {Subir Sarkar},
journal= {arXiv preprint arXiv:hep-ph/0312223},
year = {2011}
}
Comments
12 pages; invited talk at the XXXIII International Symposium on Multiparticle Dynamics, Krakow, 2003