UHECR Particle Spectra from Crypton Decays

Details UHECR Particle Spectra from Crypton Decays UHECR Particle Spectra from Crypton Decays

2005-12-12

arxiv.org/abs/astro-ph/0512303v2

Phys.Rev.D74:115003,2006

Astronomy and Astrophysics

Astrophysics

9 pages latex, 10 eps figures

Scientific paper

10.1103/PhysRevD.74.115003

We calculate the spectra of ultra-high-energy cosmic rays (UHECRs) in an explicit top-down model based on the decays of metastable neutral `crypton' states in a flipped SU(5) string model. For each of the eight specific 10th-order superpotential operators that might dominate crypton decays, we calculate the spectra of both protons and photons, using a code incorporating supersymmetric evolution of the injected spectra. For all the decay operators, the total UHECR spectra are compatible with the available data. Also, the fractions of photons are compatible with all the published upper limits, but may be detectable in future experiments.

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