Ultra High Energy Cosmic Rays Spectra in Top-Down models

Details Ultra High Energy Cosmic Rays Spectra in Top-Down models Ultra High Energy Cosmic Rays Spectra in Top-Down models

2004-09-09

arxiv.org/abs/astro-ph/0409222v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, talk presented at the CRIS 2004 conference

Scientific paper

10.1016/j.nuclphysbps.2004.10.02

In this work we present a detailed computation of the spectra of UHECR in the top-down scenario. We compare the spectra of hadrons obtained by two different methods in QCD and supersymmetric (SUSY) QCD with large primary energies $\sqrt{s}$ up to $10^{16}$ GeV. The two methods discussed are a Monte Carlo (MC) simulation and the evolution of the hadron fragmentation functions as described by the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations. The hadron spectra obtained by the two methods agree fairly well in the interesting energy range $10^{-5}M_{X}

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