Puzzling Ultrahigh Energy Cosmic Rays
KICP University of Chicago
Monday April 23d, 4PM, LPL 308
After a century of observations, the origin of cosmic rays is still a mystery. At the highest energies, sources should be among the most powerful extragalactic objects. Possible explanations have narrowed down with the confirmation of a GZK-like spectral feature and the discovery of anisotropies in the distribution of arrival directions. The anisotropy measured by the Pierre Auger Observatory raises hopes for high energy neutrino observations. However, s composition measurements point to a different interpretation. I will review the current state of ultrahigh energy cosmic ray observations and their implications for proposed acceleration models and secondary astroparticle fluxes.
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