  Several explanations for the existence of Ultra High Energy Cosmic Rays
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 cosmic rays. We have
calculated the anisotropy expected for various models of the dark matter
distribution and find that at present data are too sparse above $4 \times
10^{19}$ eV to discriminate between different models. However we show that with
data from three years of operation of the southern section of the Pierre Auger
Observatory significant progress in testing the proposals will be made.
