Seminarium "Teoria cząstek elementarnych i kosmologia"

The nature of cosmological electroweak symmetry breaking is perhaps the key question future colliders can answer. If the Universe boils when the Higgs gets a vev, then this provides good conditions to produce the observed asymmetry between matter and anti-matter. However, for decades predictions of the amount of asymmetry varies by many orders of magnitude. This means that unless conditions are extremely unfavourable, definitive statements about the status of a particular model of electroweak baryogenesis are impossible. I look at the different methods of calculating the production of baryon asymmetry, trying to derive them from first principles using the Kadanoff-Baym equations. In doing so I show why different methods produce different results and show how to resolve some of the ambiguities. Finally, I present a calculation of the electroweak baryogenesis predicted by a toy model with 2 susy like neutralinos, something that catalyses a first order electroweak phase transition and no other bsm content.