ar X iv : a st ro - p h / 04 10 41 3 v 1 1 8 O ct 2 00 4 Quantum - Gravity phenomenology and high energy particle propagation

Abstract

Already few years after the first theoretical study of the possible absorption of UHE protons on the low energy thermal photon background [1] the experimental evidence of ultra GZK cosmic rays was under debate. This situation was the starting point for some speculative work on possible new physics to explain an unexpected CR spectrum above ∼ 10eV . To our knowledge the first authors to recognize such possibility where Kirzhnits and Chechin in 1971 [2]. In their pioneering work in fact they wrote “Primary protons with energy above 5 · 10eV are expected to be strongly slowed down by the interaction with the background thermal radiation. However, no break is observed in the CR spectrum in this region. It is of course premature in this circumstances....” and the key observation was “The point is that the primary protons have a uniquely large Lorentz factor γ > 510 larger by many order of magnitudes than in any other experiment..”. With these premises they proposed a modified theory

Cite this paper

@inproceedings{Aloisio2004arXI, title={ar X iv : a st ro - p h / 04 10 41 3 v 1 1 8 O ct 2 00 4 Quantum - Gravity phenomenology and high energy particle propagation}, author={Roberto Aloisio and Pasquale Blasi and Angelo Galante and P . L . Ghia and Aurelio F. Grillo}, year={2004} }