Observational imprints from Loop Quantum Cosmology

The standard model of cosmology assumes a homogeneous and isotropic universe that undergoes a period of exponential expansion very early on, named inflation. This stretches quantum fluctuations from the onset of inflation to cosmological scales, which seed the temperature, polarization and matter an...

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Detalles Bibliográficos
Autor: Rita Barcelos Guerreiro Gonçalves, Neves
Tipo de recurso: tesis doctoral
Fecha de publicación:2024
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/103149
Acceso en línea:https://hdl.handle.net/20.500.14352/103149
Access Level:acceso abierto
Palabra clave:524.8(043.2)
Cosmología
Astrofísica
2101 Cosmología y Cosmogonía
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spelling Observational imprints from Loop Quantum CosmologyVestigios observacionales de Cosmologia Cuántica de LazosRita Barcelos Guerreiro Gonçalves, Neves524.8(043.2)CosmologíaAstrofísica2101 Cosmología y CosmogoníaThe standard model of cosmology assumes a homogeneous and isotropic universe that undergoes a period of exponential expansion very early on, named inflation. This stretches quantum fluctuations from the onset of inflation to cosmological scales, which seed the temperature, polarization and matter anisotropies that we observe. However, this paradigm ignores pre-inflationary physics, as shortly before inflation there is the initial big-bang singularity. Loop Quantum Cosmology (LQC) is a promising approach to quantum cosmology. Its most outstanding result is that of the resolution of the classical initial singularity in terms of aquantum bounce that connects a contracting branch of the Universe with an expanding one. Consequently, it provides singularity-free pre-inflationary dynamics. Within this context, it is no longer justified to consider that every mode of the cosmological perturbations reaches the onset of inflation in the natural vacuum state of standard cosmology. In fact, some modes might reach it in an excited state, which may leave imprints in their power spectra at the end of inflation and therefore in observations of the Cosmic Microwave Background (CMB). The goal of this thesis is to search for such imprints from LQC in the CMB. We work in the hybrid approach to cosmological perturbations in LQC to do so...Universidad Complutense de MadridMartín Benito, MercedesOlmedo Nieto, Javier AntonioUniversidad Complutense de Madrid20242024-04-1620242024-04-16doctoral thesishttp://purl.org/coar/resource_type/c_db06info:eu-repo/semantics/doctoralThesisapplication/pdfhttps://hdl.handle.net/20.500.14352/103149reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1031492026-06-02T12:44:21Z
dc.title.none.fl_str_mv Observational imprints from Loop Quantum Cosmology
Vestigios observacionales de Cosmologia Cuántica de Lazos
title Observational imprints from Loop Quantum Cosmology
spellingShingle Observational imprints from Loop Quantum Cosmology
Rita Barcelos Guerreiro Gonçalves, Neves
524.8(043.2)
Cosmología
Astrofísica
2101 Cosmología y Cosmogonía
title_short Observational imprints from Loop Quantum Cosmology
title_full Observational imprints from Loop Quantum Cosmology
title_fullStr Observational imprints from Loop Quantum Cosmology
title_full_unstemmed Observational imprints from Loop Quantum Cosmology
title_sort Observational imprints from Loop Quantum Cosmology
dc.creator.none.fl_str_mv Rita Barcelos Guerreiro Gonçalves, Neves
author Rita Barcelos Guerreiro Gonçalves, Neves
author_facet Rita Barcelos Guerreiro Gonçalves, Neves
author_role author
dc.contributor.none.fl_str_mv Martín Benito, Mercedes
Olmedo Nieto, Javier Antonio
Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 524.8(043.2)
Cosmología
Astrofísica
2101 Cosmología y Cosmogonía
topic 524.8(043.2)
Cosmología
Astrofísica
2101 Cosmología y Cosmogonía
description The standard model of cosmology assumes a homogeneous and isotropic universe that undergoes a period of exponential expansion very early on, named inflation. This stretches quantum fluctuations from the onset of inflation to cosmological scales, which seed the temperature, polarization and matter anisotropies that we observe. However, this paradigm ignores pre-inflationary physics, as shortly before inflation there is the initial big-bang singularity. Loop Quantum Cosmology (LQC) is a promising approach to quantum cosmology. Its most outstanding result is that of the resolution of the classical initial singularity in terms of aquantum bounce that connects a contracting branch of the Universe with an expanding one. Consequently, it provides singularity-free pre-inflationary dynamics. Within this context, it is no longer justified to consider that every mode of the cosmological perturbations reaches the onset of inflation in the natural vacuum state of standard cosmology. In fact, some modes might reach it in an excited state, which may leave imprints in their power spectra at the end of inflation and therefore in observations of the Cosmic Microwave Background (CMB). The goal of this thesis is to search for such imprints from LQC in the CMB. We work in the hybrid approach to cosmological perturbations in LQC to do so...
publishDate 2024
dc.date.none.fl_str_mv 2024
2024-04-16
2024
2024-04-16
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/103149
url https://hdl.handle.net/20.500.14352/103149
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
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.publisher.none.fl_str_mv Universidad Complutense de Madrid
publisher.none.fl_str_mv Universidad Complutense de Madrid
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,298079

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