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VOLUME 68 (1998) | ISSUE 4 | PAGE 255
Ultra high energy cosmic rays, superheavy long-living particles, and matter creation after inflation
Cosmic rays of the highest energy, above the Greisen Zatsepin Kuzmin (GZK) cut-off of the spectrum, may originate in decays of superheavy long-living particles. We conjecture that these particles may be produced naturally in the early Universe from vacuum fluctuations during inflation and may constitute a considerable fraction of Cold Dark Matter. We predict a new cut-off in the Ultra High Energy cosmic ray spectrum Ecut-off < minfiaton ^ Ю13 GeV, the exact position of the cut-off and the shape of the cosmic ray spectrum beyond the GZK cut-off being determined by the QCD quark/gluon fragmentation. The Pierre Auger Project installation may in principle observe this phenomenon.