Ultra High Energy Cosmic Rays Diffusion in an Expanding Universe

Details Ultra High Energy Cosmic Rays Diffusion in an Expanding Universe Ultra High Energy Cosmic Rays Diffusion in an Expanding Universe

2007-06-14

arxiv.org/abs/0706.2158v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of 30th International Cosmic Ray Conference (ICRC 2007), Merida, Yucatan, Mexico, 3-11 Jul 2007

Scientific paper

We study the solution of the diffusion equation for Ultra-High Energy Cosmic Rays in the general case of an expanding universe, comparing it with the well known Syrovatsky solution obtained in the more restrictive case of a static universe. The formal comparison of the two solutions with all parameters being fixed identically reveals an appreciable discrepancy. This discrepancy is less important if in both models a different set of best-fit parameters is used.

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