Effective Field Theories for Heavy Majorana Neutrinos in a Thermal Bath

In this thesis we discuss the construction of an effective field theory (EFT) for non-relativistic Majorana fermions, show how to use it to calculate observables in a thermal medium, and derive the effects of these thermal particles on the CP asymmetry.

In aceasta teza discutam constructia unei teorii de camp eficiente (EFT) pentru fermioni non-relativisti de Majorana, aratam cum sa o folosim pentru a calcula observabilele intr-un mediu termic si sa obtinem efectele acestor particule termice asupra asimetriei CP.