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Final Report Summary - SUSYDM-PHEN (Supersymmetric Dark Matter and Collider Phenomenology)

In the following years the interplay between cosmology and particle physics will provide us with detailed information about the nature of the physics that lies beyond the Standard Model (SM) of particle physics, especially in the eve of large experimental projects in particle physics and cosmology, where the European contribution is expected to be significant: the Large Hadron Collider (LHC) at CERN, the PLANCK satellite, new neutrinos telescopes etc. In this project we focus our attention on topics about Dark Matter (DM), where information can be shared between these two main fields of physics.

Supersymmetry (SUSY) is probably the best motivated extension of SM, since it answers the main theoretical weakness of the SM, that is the stability of the Higgs potential. In addition, it provides an explanation of electroweak symmetry breaking though radiative corrections, as well as a conceptual framework for unifying all the interactions of SM, including gravity in the context of its local version, supergravity (SUGRA). One of the most appealing features of the SUSY models is that, they can provide us with a stable neutral particle a suitable candidate for the DM constituent. This is the lightest supersymmetric particle (LSP). In most SUSY models this is the lightest neutralino, an admixture of the super- partners of the photon and the Higgs and Z-bosons.

Within this framework the main objectives of this proposal are:
• calculation of the DM abundance and the study of direct and indirect DM signatures in supersymmetric models with CP violation
• baryogenesis through leptogenesis in the context of supersymmetric Grant Unified Theory (GUT) models
• study of scenarios where the gravitino playing the role of the DM constituent and
• interplay between DM and Dark Energy in the context of GUT String based models.

According to the work plan during the first year of the reintegration project, the researcher was mainly concentrated into the following topics: 1) phenomenology of supersymmetric models with explicit CP-violation phases and 2) scenarios with gravitino DM.

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