UHECR Anisotropy and the Galactic Halo

Original · EN

Several explanations for the existence of Ultra High Energy Cosmic Rays (UHECR) invoke the idea that they originate from the decay of massive particles created in the reheating following inflation. It has been suggested that the decay products can explain the observed isotropic flux of UHECR. We have calculated the anisotropy expected for various models of the dark matter distribution and find that present data are too sparse above 4 x 10¹9 eV to discriminate between different models. However, after three years of operation of the southern part of the Pierre Auger Observatory great progress in testing the proposals is expected.