Please use this identifier to cite or link to this item:
http://hdl.handle.net/1843/BUOS-9PNLB9
Type: | Tese de Doutorado |
Title: | Symmetries as a guide to regularization ambiguities: Standard and Beyond Standard Model examples |
Authors: | Adriano Lana Cherchiglia |
First Advisor: | Marcos Donizeti Rodrigues Sampaio |
First Referee: | Antonio Sergio Teixeira Pires |
Second Referee: | Heron Carlos de Godoy Caldas |
Third Referee: | Ricardo Schwartz Schor |
metadata.dc.contributor.referee4: | Jose Abdalla Helayël Neto |
Abstract: | . |
Abstract: | This thesis is about regularization of ultraviolet divergences appearing in the perturbative expansion of quantum field theories (QFTs). We present a general view of the ambiguities that may arise in the regularization program and develop a systematic approach to extract them from a general Feynman amplitude. We show that they are intimately related with the breaking of the symmetries of the underlying quantum field theory. We also show they are related to the violation of momentum routing invariance (MRI) of Feynman diagrams, allowing us to regard MRI as a symmetry to be preserved in the perturbative expansion of QFTs. We apply our formalism to a variety of theories and examples such as: the Higgs decay to two photons, the photon-photon scattering, and N=1 supersymmetric electrodynamics. In all cases we verify that regularization ambiguities can be consistently extracted being related to the breaking of the symmetries of the underlying QFT. We also study the role played by quadratic divergences on a variety of examples showing its connection (or not) to the ambiguities aforementioned.of an equality to one. |
Subject: | Física |
language: | Português |
Publisher: | Universidade Federal de Minas Gerais |
Publisher Initials: | UFMG |
Rights: | Acesso Aberto |
URI: | http://hdl.handle.net/1843/BUOS-9PNLB9 |
Issue Date: | 15-Sep-2014 |
Appears in Collections: | Teses de Doutorado |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
tese_cherchiglia.pdf | 2.11 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.