Physics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001kcs..confe..14o&link_type=abstract
Presented at the KITP: Colloquium Series, Mar 14, 2001, Kavli Institute for Theoretical Physics, University of California, Santa
Physics
Scientific paper
The origin of cosmic rays with energies higher than 1020 eVremains a mystery. Accelerating particles up to these energies is achallenge even for the most energetic astrophysical objects known.While the isotropy in the arrival directions argues for a anextra-galactic origin, the photon-pion production off the cosmicbackground radiation limits the sources of such particles to systemsless than 50 Mpc away from us. The combination of large gyroradii,efficient energy losses, and isotropic arrival direction defies most ofthe proposed astrophysical accelerators as well as the more exoticalternatives. We will review recent observations along with the mostrecent theoretical models for the acceleration and propagation ofultra-high-energy cosmic rays. We will close by discussing thepotential of future observatories to resolve this astrophysical mystery.
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