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Theoretical Physycs Group at Scuola Normale Superiore
Piazza dei Cavalieri, 7
56100 Pisa PI - Italy
ph. +39 050 509203
ph. +39 050 509111

Juri Smirnov (INFN, Firenze)

Implications of Dark Matter Bound States

Abstract
The hypothesis that Dark Matter is a thermal relic of a weakly interacting particle allows to use the cosmological DM abundance to derive information on the DM mass. The latter gets fixed in theories with no extra free parameters such as Minimal Dark Matter and, even allowing for extra production mechanisms, one obtains interesting constraints. Thus it is crucial to compute thermal freeze-out abundance accurately. The relevance of the Sommerfeld effect for annihilations of Dark Matter particles has been recognised long time ago. I will discuss a second related phenomenon which is very important too: formation of bound states of two Dark Matter particles. I will present implication of these processes for the relic density computations as well as some interesting features, which could be observed in indirect detection experiments.

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