SUSY Constraints, Relic Density, and Very Early Universe
Résumé
The sensitivity of the lightest supersymmetric particle relic density calculation to different cosmological scenarios is discussed. In particular, we show that a modification of the expansion rate or of the entropy content of the Universe before Big-Bang nucleosynthesis can completely modify the relic density constraints on the SUSY parameter space, and we propose a general parametrization to study the effects of these modifications. We also show that using the relic density in the context of supersymmetric constraints is highly questionable since its calculation relies on model-dependent assumptions. On the other hand, we notice that combining the relic density calculation with the future discoveries of the LHC will hopefully give light on the Very Early Universe properties.