On the antimatter signatures of the cosmological dark matter subhalos

Details On the antimatter signatures of the cosmological dark matter subhalos On the antimatter signatures of the cosmological dark matter subhalos

2008-12-18

arxiv.org/abs/0812.3576v1

Astronomy and Astrophysics

Astrophysics

Proceeding prepared for the "Dark Matter and Dark Energy" conference (Lyon, France, July 2008) -- discussion a bit updated sin

Scientific paper

While the PAMELA collaboration has recently confirmed the cosmic ray positron excess, it is interesting to review the effects of dark matter (DM) subhalos on the predicted antimatter signals. We recall that, according to general subhalo properties as inferred from theoretical cosmology, and for DM with constant annihilation cross section, the enhancement cannot be $\gtrsim$ 20 for the antimatter yield. This bound is obviously different from that found for gamma-rays. We also recall some predictions for supersymmetric benchmark models observable at the LHC and derived in the cosmological N-body framework, illustrating in the meantime the existing discrepancy between the profiles derived from N-body experiments and the current observations of the Milky Way.

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