The University of Southampton
University of Southampton Institutional Repository

Understanding and predicting low-energy neutrino parameters with leptogenesis

Understanding and predicting low-energy neutrino parameters with leptogenesis
Understanding and predicting low-energy neutrino parameters with leptogenesis
In this work, we address two major problems of the Standard Model of particle physics: the baryon asymmetry of the Universe and neutrino masses and mixing. A strict link between these two aspects can be established by the seesaw mechanism and leptogenesis. This connection can be fruitfully exploited to gain information on neutrino parameters. To this aim, we first introduce the type-I seesaw mechanism and leptogenesis, moving then to the strong thermal leptogenesis scenario. Here a large pre-existing asymmetry is efficiently erased by leptogenesis, and an analytical lower bound on the absolute neutrino mass scale can be derived. We then consider SO(10)-inspired leptogenesis, in which a set of conditions kindred to those realised in SO(10) Grand Unification Theories is imposed on the seesaw setup. A rigorous analytical study of this scenario is performed, allowing us to obtain analytical explanations of the numerous predictions on neutrino parameters. SO(10)-inspired and strong thermal SO(10)-inspired leptogenesis appear then to represent a very interesting scenario, rich of definite predictions on neutrino parameters that will be in the reach of forthcoming experiments. Finally, we examine the supersymmetric extension of SO(10)-inspired leptogenesis, analysing how the constraints on neutrino parameters change. The lower bound imposed by thermal leptogenesis on the reheating temperature is carefully studied, in light of the gravitino problem. We conclude that the thermal leptogenesis scenario represents an intriguing and viable mechanism also in the supersymmetric framework.
Re Fiorentin, Michele
7ae3ffa8-91d7-4d80-b483-26ade83df5fd
Re Fiorentin, Michele
7ae3ffa8-91d7-4d80-b483-26ade83df5fd
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418

(2016) Understanding and predicting low-energy neutrino parameters with leptogenesis. University of Southampton, Faculty of Physical Sciences and Engineering, Doctoral Thesis, 214pp.

Record type: Thesis (Doctoral)

Abstract

In this work, we address two major problems of the Standard Model of particle physics: the baryon asymmetry of the Universe and neutrino masses and mixing. A strict link between these two aspects can be established by the seesaw mechanism and leptogenesis. This connection can be fruitfully exploited to gain information on neutrino parameters. To this aim, we first introduce the type-I seesaw mechanism and leptogenesis, moving then to the strong thermal leptogenesis scenario. Here a large pre-existing asymmetry is efficiently erased by leptogenesis, and an analytical lower bound on the absolute neutrino mass scale can be derived. We then consider SO(10)-inspired leptogenesis, in which a set of conditions kindred to those realised in SO(10) Grand Unification Theories is imposed on the seesaw setup. A rigorous analytical study of this scenario is performed, allowing us to obtain analytical explanations of the numerous predictions on neutrino parameters. SO(10)-inspired and strong thermal SO(10)-inspired leptogenesis appear then to represent a very interesting scenario, rich of definite predictions on neutrino parameters that will be in the reach of forthcoming experiments. Finally, we examine the supersymmetric extension of SO(10)-inspired leptogenesis, analysing how the constraints on neutrino parameters change. The lower bound imposed by thermal leptogenesis on the reheating temperature is carefully studied, in light of the gravitino problem. We conclude that the thermal leptogenesis scenario represents an intriguing and viable mechanism also in the supersymmetric framework.

PDF
MRF_thesis_final-1.pdf - Other
Available under License University of Southampton Thesis Licence.
Download (27MB)

More information

Published date: May 2016
Organisations: University of Southampton, Theoretical Partical Physics Group

Identifiers

Local EPrints ID: 400882
URI: http://eprints.soton.ac.uk/id/eprint/400882
PURE UUID: f2e39893-16d7-444f-b7a7-23cea0866f10

Catalogue record

Date deposited: 05 Dec 2016 14:38
Last modified: 17 Jul 2017 18:08

Export record

Contributors

Author: Michele Re Fiorentin
Thesis advisor: Pasquale Di Bari

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×