Quelques modèles au-delà du modèle standard et le problème de la baryogénèse électrofaible.

Abstract

In this work, we studied the electroweak baryogenesis through the electroweak phase transition (EWPT) which is required to be strong and of the first order to fulfill the third Sakharov condition, the existence of (EWPT) has been shown and checked numerically at all stages of the spontaneous breakdown of the gauge symmetry of three models beyond the standard model (i.e. the compact 341, the minimal 331, the economical 331 with right-handed neutrinos). Additionally, baryon number violation via sphalerons was emphasized by calculating the sphaleron rate Γ and comparing it with the Hubble constant H which is related to the expansion of our universe at temperature T.