Constraints on deviations from ΛCDM within Horndeski gravity.

Recent anomalies found in cosmological datasets such as the low multipoles of the Cosmic Microwave Background or the low redshift amplitude and growth of clustering measured by e.g., abundance of galaxy clusters and redshift space distortions in galaxy surveys, have motivated explorations of models...

Descripción completa

Detalles Bibliográficos
Autores: Bellini, Emilio, Cuesta Vázquez, Antonio José, Jiménez, Raúl (Jiménez Tellado), Verde, Licia
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/127560
Acceso en línea:https://hdl.handle.net/2445/127560
Access Level:acceso abierto
Palabra clave:Cosmologia
Cúmuls de galàxies
Astrofísica
Cosmology
Clusters of galaxies
Astrophysics
id ES_8ceda0cbbb175ebeda28caae5ef85624
oai_identifier_str oai:diposit.ub.edu:2445/127560
network_acronym_str ES
network_name_str España
repository_id_str
spelling Constraints on deviations from ΛCDM within Horndeski gravity.Bellini, EmilioCuesta Vázquez, Antonio JoséJiménez, Raúl (Jiménez Tellado)Verde, LiciaCosmologiaCúmuls de galàxiesAstrofísicaCosmologyClusters of galaxiesAstrophysicsRecent anomalies found in cosmological datasets such as the low multipoles of the Cosmic Microwave Background or the low redshift amplitude and growth of clustering measured by e.g., abundance of galaxy clusters and redshift space distortions in galaxy surveys, have motivated explorations of models beyond standard ΛCDM. Of particular interest are models where general relativity (GR) is modified on large cosmological scales. Here we consider deviations from ΛCDM+GR within the context of Horndeski gravity, which is the most general theory of gravity with second derivatives in the equations of motion. We adopt a parametrization in which the four additional Horndeski functions of time αi(t) are proportional to the cosmological density of dark energy ΩDE(t). Constraints on this extended parameter space using a suite of state-of-the art cosmological observations are presented for the first time. Although the theory is able to accommodate the low multipoles of the Cosmic Microwave Background and the low amplitude of fluctuations from redshift space distortions, we find no significant tension with ΛCDM+GR when performing a global fit to recent cosmological data and thus there is no evidence against ΛCDM+GR from an analysis of the value of the Bayesian evidence ratio of the modified gravity models with respect to ΛCDM, despite introducing extra parameters. The posterior distribution of these extra parameters that we derive return strong constraints on any possible deviations from ΛCDM+GR in the context of Horndeski gravity. We illustrate how our results can be applied to a more general frameworks of modified gravity models.Institute of Physics (IOP)2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/127560Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1088/1475-7516/2016/02/053Journal of Cosmology and Astroparticle Physics, 2016, vol. 02, num. 053, p. 1-23https://doi.org/10.1088/1475-7516/2016/02/053info:eu-repo/grantAgreement/EC/FP7/240117cc-by (c) Bellini, Emilio et al., 2016http://creativecommons.org/licenses/by/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1275602026-05-27T06:46:51Z
dc.title.none.fl_str_mv Constraints on deviations from ΛCDM within Horndeski gravity.
title Constraints on deviations from ΛCDM within Horndeski gravity.
spellingShingle Constraints on deviations from ΛCDM within Horndeski gravity.
Bellini, Emilio
Cosmologia
Cúmuls de galàxies
Astrofísica
Cosmology
Clusters of galaxies
Astrophysics
title_short Constraints on deviations from ΛCDM within Horndeski gravity.
title_full Constraints on deviations from ΛCDM within Horndeski gravity.
title_fullStr Constraints on deviations from ΛCDM within Horndeski gravity.
title_full_unstemmed Constraints on deviations from ΛCDM within Horndeski gravity.
title_sort Constraints on deviations from ΛCDM within Horndeski gravity.
dc.creator.none.fl_str_mv Bellini, Emilio
Cuesta Vázquez, Antonio José
Jiménez, Raúl (Jiménez Tellado)
Verde, Licia
author Bellini, Emilio
author_facet Bellini, Emilio
Cuesta Vázquez, Antonio José
Jiménez, Raúl (Jiménez Tellado)
Verde, Licia
author_role author
author2 Cuesta Vázquez, Antonio José
Jiménez, Raúl (Jiménez Tellado)
Verde, Licia
author2_role author
author
author
dc.subject.none.fl_str_mv Cosmologia
Cúmuls de galàxies
Astrofísica
Cosmology
Clusters of galaxies
Astrophysics
topic Cosmologia
Cúmuls de galàxies
Astrofísica
Cosmology
Clusters of galaxies
Astrophysics
description Recent anomalies found in cosmological datasets such as the low multipoles of the Cosmic Microwave Background or the low redshift amplitude and growth of clustering measured by e.g., abundance of galaxy clusters and redshift space distortions in galaxy surveys, have motivated explorations of models beyond standard ΛCDM. Of particular interest are models where general relativity (GR) is modified on large cosmological scales. Here we consider deviations from ΛCDM+GR within the context of Horndeski gravity, which is the most general theory of gravity with second derivatives in the equations of motion. We adopt a parametrization in which the four additional Horndeski functions of time αi(t) are proportional to the cosmological density of dark energy ΩDE(t). Constraints on this extended parameter space using a suite of state-of-the art cosmological observations are presented for the first time. Although the theory is able to accommodate the low multipoles of the Cosmic Microwave Background and the low amplitude of fluctuations from redshift space distortions, we find no significant tension with ΛCDM+GR when performing a global fit to recent cosmological data and thus there is no evidence against ΛCDM+GR from an analysis of the value of the Bayesian evidence ratio of the modified gravity models with respect to ΛCDM, despite introducing extra parameters. The posterior distribution of these extra parameters that we derive return strong constraints on any possible deviations from ΛCDM+GR in the context of Horndeski gravity. We illustrate how our results can be applied to a more general frameworks of modified gravity models.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/127560
url https://hdl.handle.net/2445/127560
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1088/1475-7516/2016/02/053
Journal of Cosmology and Astroparticle Physics, 2016, vol. 02, num. 053, p. 1-23
https://doi.org/10.1088/1475-7516/2016/02/053
info:eu-repo/grantAgreement/EC/FP7/240117
dc.rights.none.fl_str_mv cc-by (c) Bellini, Emilio et al., 2016
http://creativecommons.org/licenses/by/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Bellini, Emilio et al., 2016
http://creativecommons.org/licenses/by/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Physics (IOP)
publisher.none.fl_str_mv Institute of Physics (IOP)
dc.source.none.fl_str_mv Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869412972738117632
score 15.300719

Similares en LA Referencia