The GZK Bound in Discrete Space

Abstract

The maximum distance bound for ultrahigh energy cosmic rays (UHECR) with energies above the Greisen-Zatsepin-Kuzmich cutoff $\sim 10^{19}eV$ relaxes significantly if there is some mechanism that forces UHECR to propagate in discrete intervals, rather than continuously, through intergalactic space. In particular, intervals as small as a femtometer relax the bound for protons by an order of magnitude and potentially account for the observed excess of UHECR flux.

3 pages

References in corpus (2)

• Sources of sub-GZK cosmic rays
• A Cluster of Ultrahigh Energy Cosmic Rays