The Origin of Ultra-High Energy Cosmic Rays

Details The Origin of Ultra-High Energy Cosmic Rays The Origin of Ultra-High Energy Cosmic Rays

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..aprb14008t&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #B14.008

Physics

Scientific paper

The mechanisms that produce ultra-high energy cosmic rays (UHECRs) will likely require foundations beyond the physics of the Standard Model. We review the cosmic ray energy spectrum with a focus on the concerns that arise from those cosmic rays with energies beyond the Griesen-Zatsepin-Kuzmin (GZK) cutoff. The sky distribution of cosmic rays with energies above the GZK cutoff holds important clues to their origin. We investigate whether top-down scenarios, most notably, the decays of massive relic particles called wimpzillas clustered in the galactic dark matter halo, can explain present observations. Finally, we discuss future experimental work that will dramatically increase the number of detections, the Pierre Auger Observatory.

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