On the antimatter signatures of the cosmological dark matter subhalos

While the PAMELA collaboration has recently confirmed the cosmic ray positron excess, it is interesting to review the effects of dark matter subhalos on the predicted antimatter signals. We recall that, according to the general subhalo properties as inferred from theoretical cosmology, the enhancement cannot be larger than ~20 for the antimatter yield. This bound is obviously different from what is found for $\gamma$-rays. We also show some predictions for supersymmetric benchmark models observable at the LHC and derived in the cosmological N-body framework, but remind the existing discrepancy between the profiles derived from N-body experiments and the current observations.