Should One Really Expect a GZK Cutoff?

Details Should One Really Expect a GZK Cutoff? Should One Really Expect a GZK Cutoff?

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2..647p&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

We investigate the effect of a random extragalactic magnetic field on the propagation of charged particles above 1018 eV, and show that for field values in the 100nG range, the transition between the diffusive and ballistic regimes occurs in the same energy range as the GZK cutoff (a few 1019 eV). The interpretation of the latter as a decrease in the flux due to the sudden reduction of the visible horizon is therefore modified. Moreover, the size of the sphere of diffusion of a continuous cosmic-ray source being of the order of 10 Mp c, the local structure of the universe and therefore of potential astrophysical sources plays a dominant role in the expected flux. Under reasonable assumptions on the sources configuration, the expected GZK cutoff may even disapp ear.

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