Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-08-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, harvmac
Scientific paper
Explanations of the origin of ultra-high energy cosmic rays are severely constrained by the Greisen-Zatsepin-Kuz'min effect, which limits their propagation over cosmological distances. We argue that possible departures from strict Lorentz invariance, too small to have been detected otherwise, can affect elementary-particle kinematics so as to suppress or forbid inelastic collisions of cosmic-ray nucleons with background photons. Thereby can the GZK cutoff be relaxed or removed.
Coleman Sidney
Glashow Sheldon L.
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