Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-02-05
Astronomy and Astrophysics
Astrophysics
Contributed Paper to the 18th Texas Symposium on Rel. Astrophysics and Cosmology, Chicago 1996. 3 Pages, no figures
Scientific paper
In a gravitationally unstable universe, the structure of dark matter and galaxies, intergalactic gas and magnetic field can have severe impact on the propagation of ultra high energy cosmic rays (UHECR) (Ryu & Kang, this proceedings). The possible effects include spatial confinement and directional focusing along the supergalactic matter sheets, as well as universal re-acceleration at large scale shock fronts, and spectral modification due to energy dependent leakage into cosmic voids. As a result, the GZK-cutoff may be less pronounced and occur at a higher energy, where the stochastic nature of both acceleration and energy loss processes has to be taken into account.
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