The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology

We investigate the role played by the vacuum of the primordial fluctuations in hybrid Loop Quantum Cosmology. We consider scenarios where the inflaton potential is a mass term and the unperturbed quantum geometry is governed by the effective dynamics of Loop Quantum Cosmology. In this situation, the...

Descripción completa

Detalles Bibliográficos
Autores: Elizaga Navascués, Beatriz, Martín de Blas, Daniel, Mena Marugán, Guillermo A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/171480
Acceso en línea:http://hdl.handle.net/10261/171480
Access Level:acceso abierto
Palabra clave:Loop Quantum Gravity
Cosmology
Quantum field theory
Curved Backgrounds
id ES_9bc1f753cb9844559da4871fa4ea9a4e
oai_identifier_str oai:digital.csic.es:10261/171480
network_acronym_str ES
network_name_str España
repository_id_str
spelling The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum CosmologyElizaga Navascués, BeatrizMartín de Blas, DanielMena Marugán, Guillermo A.Loop Quantum GravityCosmologyQuantum field theoryCurved BackgroundsWe investigate the role played by the vacuum of the primordial fluctuations in hybrid Loop Quantum Cosmology. We consider scenarios where the inflaton potential is a mass term and the unperturbed quantum geometry is governed by the effective dynamics of Loop Quantum Cosmology. In this situation, the phenomenologically interesting solutions have a preinflationary regime where the kinetic energy of the inflaton dominates over the potential. For these kind of solutions, we show that the primordial power spectra depend strongly on the choice of vacuum. We study in detail the case of adiabatic states of low order and the non-oscillating vacuum introduced by Martín de Blas and Olmedo, all imposed at the bounce. The adiabatic spectra are typically suppressed at large scales, and display rapid oscillations with an increase of power at intermediate scales. In the non-oscillating vacuum, there is power suppression for large scales, but the rapid oscillations are absent. We argue that the oscillations are due to the imposition of initial adiabatic conditions in the region of kinetic dominance, and that they would also be present in General Relativity. Finally, we discuss the sensitivity of our results to changes of the initial time and other data of the model.This work was supported by the Spanish MINECO grants number FIS2014-54800-C2-2-P and FIS2017-86497-C2-2-PPeer reviewedMultidisciplinary Digital Publishing InstituteMinisterio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2018201820182018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/171480reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2014-54800-C2-2-Pinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2017-86497-C2-2-Phttps://doi.org/10.3390/universe4100098Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1714802026-05-22T06:33:51Z
dc.title.none.fl_str_mv The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
title The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
spellingShingle The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
Elizaga Navascués, Beatriz
Loop Quantum Gravity
Cosmology
Quantum field theory
Curved Backgrounds
title_short The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
title_full The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
title_fullStr The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
title_full_unstemmed The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
title_sort The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
dc.creator.none.fl_str_mv Elizaga Navascués, Beatriz
Martín de Blas, Daniel
Mena Marugán, Guillermo A.
author Elizaga Navascués, Beatriz
author_facet Elizaga Navascués, Beatriz
Martín de Blas, Daniel
Mena Marugán, Guillermo A.
author_role author
author2 Martín de Blas, Daniel
Mena Marugán, Guillermo A.
author2_role author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Loop Quantum Gravity
Cosmology
Quantum field theory
Curved Backgrounds
topic Loop Quantum Gravity
Cosmology
Quantum field theory
Curved Backgrounds
description We investigate the role played by the vacuum of the primordial fluctuations in hybrid Loop Quantum Cosmology. We consider scenarios where the inflaton potential is a mass term and the unperturbed quantum geometry is governed by the effective dynamics of Loop Quantum Cosmology. In this situation, the phenomenologically interesting solutions have a preinflationary regime where the kinetic energy of the inflaton dominates over the potential. For these kind of solutions, we show that the primordial power spectra depend strongly on the choice of vacuum. We study in detail the case of adiabatic states of low order and the non-oscillating vacuum introduced by Martín de Blas and Olmedo, all imposed at the bounce. The adiabatic spectra are typically suppressed at large scales, and display rapid oscillations with an increase of power at intermediate scales. In the non-oscillating vacuum, there is power suppression for large scales, but the rapid oscillations are absent. We argue that the oscillations are due to the imposition of initial adiabatic conditions in the region of kinetic dominance, and that they would also be present in General Relativity. Finally, we discuss the sensitivity of our results to changes of the initial time and other data of the model.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/171480
url http://hdl.handle.net/10261/171480
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2014-54800-C2-2-P
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2017-86497-C2-2-P
https://doi.org/10.3390/universe4100098
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869414581922693120
score 15,81155

Similares en LA Referencia