Scenarios of Gravitino Dark Matter and their Cosmological and Particle Physics Implications

I report on some scenarios where the gravitino is the dark matter and the supersymmetry breaking mediated by a gauge sector.

Complementarity of Gamma-ray and LHC Searches for Neutralino Dark Matter in the Focus Point Region

We study the complementarity between the indirect detection of dark matter with gamma-rays in H.E.S.S. and the supersymmetry searches with ATLAS at the Large Hadron Collider in the Focus Point region within the mSUGRA framework. The sensitivity of the central telescope of the H.E.S.S. II experiment with an energy threshold of ~ 20 GeV is investigated. We show that the detection of gamma-ray fluxes of O(10^-12) cm-2s-1 with H.E.S.S. II covers a substantial part of the Focus Point region which may be more difficult for LHC experiments. Despite the presence of multi-TeV scalars, we show that LHC will be sensitive to a complementary part of this region through three body NLSP leptonic decays. This interesting complementarity between H.E.S.S. II and LHC searches is further highlighted in terms of the gluino mass and the two lightest neutralino mass difference.

The dark matter as a light gravitino (II)

We address the question of gravitino dark matter in the context of gauge mediated supersymmetry breaking models.