TH seminar - Scenarios of stable gravitino LSP and their implications [Prof. Gilbert Moultaka (Montpellier)]

Thursday 26 Feb 2009, 16:15 → 17:15 Europe/Brussels

Abstract: The mechanism underlying the transmission of supersymmetry breaking to the (supersymmetrized) standard model is expected to trigger the electroweak symmetry breaking, and to imprint the properties of the lighter part of the susy sector that can be studied at the colliders. These properties could in turn have an important bearing on the question of the nature of non-baryonic dark matter in the Universe, or on other early universe issues such as the primordial nucleosynthesis of the light elements. Moreover, depending on whether the susy breaking messenger/hidden sector is produced in the early universe or not, standard or non-standard thermal histories can ensue, leading to different constraints. In this talk we present some of the possible scenarios, both in gravity mediated and gauge mediated susy breaking settings, assuming the lightest supersymmetric particle to be a stable gravitino. We show how the latter can account for the dark matter and incidentally how some open questions regarding the light elements could be answered.