Physics – Nuclear Physics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nuphs..28...85q&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 28, Issue 2, p. 85-89.
Physics
Nuclear Physics
1
Scientific paper
Assuming that active galactic nuclei relativistic jets provide the most favourable sites for Cosmic Ray acceleration to the highest energies, the problem of predicting the upper cut off to the spectrum is re-examined. Numerical simulations of shock acceleration are performed for parallel and near perpendicular shocks and a relativistic speed-up of acceleration in comparison with that predicted by standard theory involving the effective diffusion coefficient normal to the shock surface is confirmed, both for relativistic parallel shocks and any near perpendicular shock where the de Hoffman-Teller frame is moving relativistically. However, likely diffusive escape times derived from AGN radio estimates of the field limit the maximum cut off to about 1020eV total energy.
The predictions of Bhattacharjee [1] that the decay of Cosmic Strings could produce measurable cosmic ray fluxes above 1020eV are briefly discussed. `Cusp evaporation' will not work but some unknown mechanism for dissipating 10-3 of string energy into energetic particles is susceptible to experimental investigation above 1020eV, provided we are confident in understanding conventional acceleration.
Lieu Richard
Naidu Kamcilla
Quenby John J.
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