Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-03
Pramana62:207-218,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited plenary talk at PASCOS03, Mumbai, India, January 2003; 13 pages, 1 figure
Scientific paper
10.1007/BF02705083
The origin of cosmic ray events with $E \gsim 10^{11}$ GeV remains mysterious. In this talk I briefly summarize several proposed particle physics explanations: a breakdown of Lorentz invariance, the ``$Z-$burst'' scenario, new hadrons with masses of several GeV as primaries, and magnetic monopoles with mass below $10^{10}$ GeV as primaries. I then describe in a little more detail the idea that these events are due to the decays of very massive, long--lived exotic particles.
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