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It has been speculated that the recently detected ultra-high energy cosmic rays may originate from the decays of relic particles with mass of order 10 12 <space>GeV clustered in the halo of our Galaxy. This hypothesis can be tested through forthcoming measurements of the spectra of both high energy cosmic nucleons and neutrinos, which are determined in this model by the physics...
The expected proton and neutrino fluxes from decays of massive metastable relic particles are calculated using the HERWIG QCD event generator. The predicted proton spectrum can account for the observed flux of extremely high energy cosmic rays beyond the Greisen-Zatsepin-Kuzmin cutoff, for a decaying particle mass of O(10 12 ) GeV. The lifetime required is of O(10 20 )...
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