GZK Violation - a Tempest in a (Magnetic) Teapot?

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  • 27 June 1999
Abstract
Faraday rotation measurements are used to constrain simple models representing possible extremes of the structure of extra-galactic magnetic fields (EGMFs). Relevant fields are found quite generally to be at the $\mu$G level rather than the nG level usually assumed. Even the highest energy cosmic ray protons should experience large deflections over distances of order 1 Mpc. Such large deflections allow either GRBs or AGNs to be the source of ultrahigh energy cosmic rays, with AGNs tolerating greater inefficiency in the cosmic ray acceleration mechanism.

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