
In this lecture I outline some of the underlying physics issues associated with accelerators plausibly capable of explaining the UHECRs up to ZeV energies. I concentrate on the concentrate on mechanisms and their constraints, but provide a brief background on on observations and the constraints they supply, as well.
20 pages, including 3 figures. To be published in proceedings of the 9th Chalonge School on Astrofundamental Physics, Palermo, Sicily, September 7-18, 2002. Ed: N. Sanchez, Kluwer Academic Publishers
Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
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