Electroweak baryogenesis in scale-invariant extensions of the Standard Model

Abstract

The aim of this thesis is to study certain aspects of electroweak baryogenesis. First we will describe in depth the concept of baryogenesis and give an introduction to the main topics, results and setbacks. The second chapter is devoted to the study of two paradigms of baryogenesis: electroweak baryogenesis and leptogenesis. In the third chapter, we study the kinetic equations for Weyl, Majorana and Dirac spinors, trying to understand how their different nature affects the dynamics. Then, we proceed with the calculations on the dynamics of the bubble walls coming from a first-order phase transition, where a method for computing the expectation value of the stress-energy tensor is developed and used in the case of quantum fields in thermal background. Lastly, we explore the scale-invariant extensions of the Standard Model and try to understand if baryogenesis is possible in them.