Constraints on Dark Matter large annihilation cross-section from the early Universe

por Fabio Iocco (Institut d'astrophysique de Paris)

jueves 8 oct. 2009 12:30 → 13:30 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

I will show how it is possible to place stringent constraints on high DM self-annihilation cross sections making use of cosmological observables. Current CMB measurements do in fact allow the possibility to limit down to the thermal values for particle masses of few GeV, with constraints that depend only on cosmological paramaters, and are not affected by astrophysical uncertainties. It is also possible to place strong constraints on self--annihilation cross sections by using observations related to the Epoch of Reionization, relying in this case on structure formation scenarios.