Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-17
Astronomy and Astrophysics
Astrophysics
Invited Review Talk at "Physics in Collision", Seoul, Korea, June 28 - 30, 2001. No change in content, small changes in the re
Scientific paper
The universe should be dark at energies exceeding $\sim 5\times 10^{19}$ eV. This simple but solid prediction of our best known particle physics is not confirmed by observations, that seem to suggest a quite different picture. Numerous events have in fact been detected in this energy region, with spectra and anisotropy features that defy many conventional and unconventional explanations. Is there a problem with known physics or is this a result of astrophysical uncertainties? Here we try to answer these questions, in the light of present observations, while discussing which information future observations may provide on this puzzling issue.
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