Effective Field Theories for Heavy Majorana Neutrinos in a Thermal Bath

by Simone Biondini

Overview

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.

The methods described in this thesis allow a systematic and effective description of the non-relativistic dynamics of a heavy Majorana fermion at finite temperature. The CP asymmetry is studied for hierarchical and nearly degenerate heavy-neutrino masses and the analysis includes the treatment of lepton-flavor effects.

Heavy Majorana neutrinos are involved in many scenarios of physics beyond the standard model and, in the leptogenesis framework, they are at the root of the baryon asymmetry in the Universe. Besides simplifying exist

in

g results, the EFT approach provides useful tools for addressing even more involved observables. Indeed, taken together, the approach and the material presented here represent an important step toward a systematic improvement of our knowledge of the CP asymmetry in heavy-neutrino decays at finite temperature.

Product Details

ISBN-13:	9783319639000
Publisher:	Springer International Publishing
Publication date:	08/03/2017
Series:	Springer Theses
Edition description:	1st ed. 2017
Pages:	215
Product dimensions:	6.10(w) x 9.25(h) x (d)

About the Author

After completing the Bachelor and Master in Physics at the University of Perugia in Italy, the author joined the international research program of the Max Planck Institute for Physics in Munich to carry out his Ph.D. He worked in the group led by Prof. Nora Brambilla at the Technische Universitaet Muenchen. Currently the author is a postdoc at the Albert Einstein Center at the University of Bern, where he continues his research on the physics of the early universe including dark matter, leptogenesis and quark-gluon plasma.  

Table of Contents

Baryon Asymmetry in the Early Universe.- Baryogenesis via Leptogenesis.- Effective Field Theories.- Thermal Field Theory in a Nutshell.- EFT Approach for Right-handed Neutrinos in a Thermal Bath.- CP Asymmetries at Finite Temperature: the Nearly Degenerate Case.- CP Asymmetries at Finite Temperature: the Hierarchical Case.- Flavoured CP Asymmetries.