Theoretical and observational aspects of the variation of fundamental constants of Nature

Albareti, Franco Dante

Theoretical and observational aspects of the variation of fundamental constants of Nature

Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica. Fecha de lectura: 14-01-2019

Detalles Bibliográficos
Autor:	Albareti, Franco Dante
Tipo de recurso:	tesis doctoral
Fecha de publicación:	2019
País:	España
Institución:	Universidad Autónoma de Madrid
Repositorio:	Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:	español
OAI Identifier:	oai:repositorio.uam.es:10486/686742
Acceso en línea:	http://hdl.handle.net/10486/686742
Access Level:	acceso abierto
Palabra clave:	Teoría cuántica de campos - Tesis doctorales Cuásares - Tesis doctorales Espectroscopía astronómica - Tesis doctorales Física

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spelling	Theoretical and observational aspects of the variation of fundamental constants of NatureAlbareti, Franco DanteTeoría cuántica de campos - Tesis doctoralesCuásares - Tesis doctoralesEspectroscopía astronómica - Tesis doctoralesFísicaTesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica. Fecha de lectura: 14-01-2019The fundamental constants of Nature play a crucial role in our understanding of the Universe. They represent the limits of our knowledge of the laws of Physics but at the same time encode new phenomena yet to be discovered. In recent years, an enormous observational effort has been devoted to study the possible variation in space and time of some of these fundamental constants. Such a discovery would have deep consequences in our current models for physical interactions, and in particular for the theoretical framework behind gravitation. Astrophysics and Cosmology provide us with a great window to look for any variation, with space and time scales ranging from the Solar System to the whole observable Universe and its origin. On the other side, theoretical models to accommodate variation of fundamental constants are also being actively explored. This thesis is divided into an observational analysis and a theoretical study. First, we present the most precise observational constraint to date for the cosmological variation of the fine structure constant using emission lines present in quasar spectra up to redshift z = 1. From the Sloan Digital Sky Survey Quasar Catalog (Data Release 12), we build a sample of 13 175 quasar spectra showing the [O iii] doublet ( 4960; 5008 Å). Then, by measuring the separation between both lines we obtain the following relative constraint on the time variation of the fine structure constant = ¹0:9 1:8º 10��5. We also impose limits on its variation in redshift bins ( z 0:06) over the last 7.9 Gyr at the 10��4 level. Several sources of systematics are analyzed including sky contamination and line blendings. In the second part, we explore a theoretical mechanism producing expectations values of scalar fields to depend on the gravitational potential. To have varying expectation values is one of the usual ways to accommodate variation of fundamental constants. We develop a formalism that enables us to compute the complete one-loop quantum corrections to the effective potential and energy momentum tensor of scalar fields arising in the presence of gravity. This formalism provides the local part, usually computed with the well-known DeWitt-Schwinger expansion, but it would also allow to obtain the non-local contributions. Assuming weak and slowly varying gravitational fields, we obtain a complete set of mode solutions for the Klein-Gordon equation in perturbed Friedmann-Robertson-Walker geometries at leading order in the adiabatic approximation. Then, we compute the corresponding expectation values of a self-interacting scalar field as a mode summation in different quantum states and apply dimensional regularization to obtain the final contributions. Although there is no effect due to metric perturbation in vacuum states, there are thermal corrections that could modify the expectation value of scalar fieldsLópez Maroto, AntonioPrada Martínez, FranciscoDepartamento de Física TeóricaFacultad de Ciencias20192019-01-14doctoral thesishttp://purl.org/coar/resource_type/c_db06NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/doctoralThesisapplication/pdfhttp://hdl.handle.net/10486/686742reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridEspañolspaopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6867422026-06-23T12:46:27Z
dc.title.none.fl_str_mv	Theoretical and observational aspects of the variation of fundamental constants of Nature
title	Theoretical and observational aspects of the variation of fundamental constants of Nature
spellingShingle	Theoretical and observational aspects of the variation of fundamental constants of Nature Albareti, Franco Dante Teoría cuántica de campos - Tesis doctorales Cuásares - Tesis doctorales Espectroscopía astronómica - Tesis doctorales Física
title_short	Theoretical and observational aspects of the variation of fundamental constants of Nature
title_full	Theoretical and observational aspects of the variation of fundamental constants of Nature
title_fullStr	Theoretical and observational aspects of the variation of fundamental constants of Nature
title_full_unstemmed	Theoretical and observational aspects of the variation of fundamental constants of Nature
title_sort	Theoretical and observational aspects of the variation of fundamental constants of Nature
dc.creator.none.fl_str_mv	Albareti, Franco Dante
author	Albareti, Franco Dante
author_facet	Albareti, Franco Dante
author_role	author
dc.contributor.none.fl_str_mv	López Maroto, Antonio Prada Martínez, Francisco Departamento de Física Teórica Facultad de Ciencias
dc.subject.none.fl_str_mv	Teoría cuántica de campos - Tesis doctorales Cuásares - Tesis doctorales Espectroscopía astronómica - Tesis doctorales Física
topic	Teoría cuántica de campos - Tesis doctorales Cuásares - Tesis doctorales Espectroscopía astronómica - Tesis doctorales Física
description	Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica. Fecha de lectura: 14-01-2019
publishDate	2019
dc.date.none.fl_str_mv	2019 2019-01-14
dc.type.none.fl_str_mv	doctoral thesis http://purl.org/coar/resource_type/c_db06 NA http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv	info:eu-repo/semantics/doctoralThesis
format	doctoralThesis
dc.identifier.none.fl_str_mv	http://hdl.handle.net/10486/686742
url	http://hdl.handle.net/10486/686742
dc.language.none.fl_str_mv	Español spa
language_invalid_str_mv	Español
language	spa
dc.rights.none.fl_str_mv	open access http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv	info:eu-repo/semantics/openAccess
rights_invalid_str_mv	open access http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv	openAccess
dc.format.none.fl_str_mv	application/pdf
dc.source.none.fl_str_mv	reponame:Biblos-e Archivo. Repositorio Institucional de la UAM instname:Universidad Autónoma de Madrid
instname_str	Universidad Autónoma de Madrid
reponame_str	Biblos-e Archivo. Repositorio Institucional de la UAM
collection	Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score	15,301603

Theoretical and observational aspects of the variation of fundamental constants of Nature

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