25–28 Sept 2012
DESY Hamburg
Europe/Berlin timezone

WIMP Dark Matter from Gravitino Decays and Leptogenesis

27 Sept 2012, 14:40
20m
Seminar room 2 (DESY)

Seminar room 2

DESY

Cosmology & Astroparticle Physics Parallel Session 2: Cosmology & Astroparticle Physics

Speaker

Kai Schmitz (DESY)

Description

The spontaneous breaking of B-L symmetry naturally accounts for the small observed neutrino masses via the seesaw mechanism. We have recently shown that the cosmological realization of B-L breaking in a supersymmetric theory can successfully generate the initial conditions of the hot early universe, i.e. entropy, baryon asymmetry and dark matter, if the gravitino is the lightest superparticle (LSP). This implies relations between neutrino and superparticle masses. Here we extend our analysis to the case of very heavy gravitinos which are motivated by the discovery of the Higgs boson at the LHC. We find that the nonthermal production of `pure' wino or higgsino LSPs, i.e. weakly interacting massive particles (WIMPs), in heavy gravitino decays can account for the observed amount of dark matter while simultaneously fulfilling the constraints imposed by primordial nucleosynthesis and leptogenesis within a range of LSP, gravitino and neutrino masses. For instance, a mass of the lightest neutrino of 0.05 eV would require a higgsino mass below 900 GeV and a gravitino mass of at least 10 TeV.

Primary authors

Presentation materials