Another paper for Monday

I know that there are already many papers to discuss this Monday, but Fabio and I would like to suggest another paper on ultrahigh energy cosmic rays and neutrinos:

arXiv:0902.3993v1 "Neutrino diagnostics of ultra-high energy cosmic ray protons"
by Markus Ahlers, Luis A. Anchordoqui, Subir Sarkar

My Japanese collaborator Shigehiro Nagataki who works on the central engine of GRBs, neutrinos and ultrahigh energy cosmic rays (and who will also give a seminar in the morning) will be there, so he might have some comments on this paper too.