States of low energy in bouncing inflationary scenarios in loop quantum cosmology

In generic Friedmann-Lemaître-Robertson-Walker spacetimes, states of low energy (SLEs) are defined to minimize the regularized energy density smeared along the timelike curve of an isotropic observer, which is specified via a smearing function. For every smearing function, SLEs are unique (up to a p...

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Detalles Bibliográficos
Autores: Martín Benito, Mercedes, Neves, Rita B., Olmedo, Javier
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/113784
Acceso en línea:https://hdl.handle.net/20.500.14352/113784
Access Level:acceso abierto
Palabra clave:53
Quantum cosmology
Cosmic microwave background
Física (Física)
2212 Física Teórica
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oai_identifier_str oai:docta.ucm.es:20.500.14352/113784
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spelling States of low energy in bouncing inflationary scenarios in loop quantum cosmologyMartín Benito, MercedesNeves, Rita B.Olmedo, Javier53Quantum cosmologyCosmic microwave backgroundFísica (Física)2212 Física TeóricaIn generic Friedmann-Lemaître-Robertson-Walker spacetimes, states of low energy (SLEs) are defined to minimize the regularized energy density smeared along the timelike curve of an isotropic observer, which is specified via a smearing function. For every smearing function, SLEs are unique (up to a phase) and are shown to be exact Hadamard states. In this work, we investigate the viability of SLEs as the vacuum for cosmological perturbations in hybrid loop quantum cosmology, motivated by the fact that SLEs have been shown to provide suitable vacua in models where a period of kinetic dominance precedes inflation. We find that there are two classes of smearing functions that can be seen as natural choices within this context, for which the corresponding SLEs and the resulting power spectra at the end of inflation are quite insensitive to the exact shape and support of the smearing function. Furthermore, a preliminary analysis of the tensor-to-scalar ratio and of the spectral index indicates as good an agreement with observations as that of standard cosmology.American Physical SocietyUniversidad Complutense de Madrid20212021-06-0920212021-06-09journal articlehttp://purl.org/coar/resource_type/c_6501AOhttp://purl.org/coar/version/c_b1a7d7d4d402bcceinfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/113784reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)InglésengAgencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 PID2019-105943GB-I00 TEORIAS EFECTIVAS DE GRAVEDAD Y COSMOLOGIAMinisterio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 Not available PID2019–105943GB-I00FEDER Not available E-FQM-262-UGR18open accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1137842026-06-02T12:44:21Z
dc.title.none.fl_str_mv States of low energy in bouncing inflationary scenarios in loop quantum cosmology
title States of low energy in bouncing inflationary scenarios in loop quantum cosmology
spellingShingle States of low energy in bouncing inflationary scenarios in loop quantum cosmology
Martín Benito, Mercedes
53
Quantum cosmology
Cosmic microwave background
Física (Física)
2212 Física Teórica
title_short States of low energy in bouncing inflationary scenarios in loop quantum cosmology
title_full States of low energy in bouncing inflationary scenarios in loop quantum cosmology
title_fullStr States of low energy in bouncing inflationary scenarios in loop quantum cosmology
title_full_unstemmed States of low energy in bouncing inflationary scenarios in loop quantum cosmology
title_sort States of low energy in bouncing inflationary scenarios in loop quantum cosmology
dc.creator.none.fl_str_mv Martín Benito, Mercedes
Neves, Rita B.
Olmedo, Javier
author Martín Benito, Mercedes
author_facet Martín Benito, Mercedes
Neves, Rita B.
Olmedo, Javier
author_role author
author2 Neves, Rita B.
Olmedo, Javier
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 53
Quantum cosmology
Cosmic microwave background
Física (Física)
2212 Física Teórica
topic 53
Quantum cosmology
Cosmic microwave background
Física (Física)
2212 Física Teórica
description In generic Friedmann-Lemaître-Robertson-Walker spacetimes, states of low energy (SLEs) are defined to minimize the regularized energy density smeared along the timelike curve of an isotropic observer, which is specified via a smearing function. For every smearing function, SLEs are unique (up to a phase) and are shown to be exact Hadamard states. In this work, we investigate the viability of SLEs as the vacuum for cosmological perturbations in hybrid loop quantum cosmology, motivated by the fact that SLEs have been shown to provide suitable vacua in models where a period of kinetic dominance precedes inflation. We find that there are two classes of smearing functions that can be seen as natural choices within this context, for which the corresponding SLEs and the resulting power spectra at the end of inflation are quite insensitive to the exact shape and support of the smearing function. Furthermore, a preliminary analysis of the tensor-to-scalar ratio and of the spectral index indicates as good an agreement with observations as that of standard cosmology.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-06-09
2021
2021-06-09
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AO
http://purl.org/coar/version/c_b1a7d7d4d402bcce
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/113784
url https://hdl.handle.net/20.500.14352/113784
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 PID2019-105943GB-I00 TEORIAS EFECTIVAS DE GRAVEDAD Y COSMOLOGIA
Ministerio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 Not available PID2019–105943GB-I00
FEDER Not available E-FQM-262-UGR18
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 American Physical Society
publisher.none.fl_str_mv American Physical Society
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 15,812429

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