New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75

We have assembled a compilation of observational Hubble parameter measurements estimated with the differential evolution of cosmic chronometers, in the redshift range 0 < z < 1.75. This sample has been used, in combination with CMB data and with the most recent estimate of the Hubble constant...

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Detalles Bibliográficos
Autores: Moresco, Michele, Verde, Licia, Pozzetti, Lucia, Jiménez, Raúl (Jiménez Tellado), Cimatti, Andrea
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2012
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/127551
Acceso en línea:https://hdl.handle.net/2445/127551
Access Level:acceso abierto
Palabra clave:Expansió de l'univers
Cosmologia
Astrofísica
Expanding universe
Cosmology
Astrophysics
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spelling New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75Moresco, MicheleVerde, LiciaPozzetti, LuciaJiménez, Raúl (Jiménez Tellado)Cimatti, AndreaExpansió de l'universCosmologiaAstrofísicaExpanding universeCosmologyAstrophysicsWe have assembled a compilation of observational Hubble parameter measurements estimated with the differential evolution of cosmic chronometers, in the redshift range 0 < z < 1.75. This sample has been used, in combination with CMB data and with the most recent estimate of the Hubble constant H0, to derive new constraints on several cosmological parameters. The new Hubble parameter data are very useful to break some of the parameter degeneracies present in CMB-only analysis, and to constrain possible deviations from the standard (minimal) flat ΛCDM model. The H(z) data are especially valuable in constraining Ωk and ΩDE in models that allow a variation of those parameters, yielding constraints that are competitive with those obtained using Supernovae and/or baryon acoustic oscillations. We also find that our H(z) data are important to constrain parameters that do no affect directly the expansion history, by breaking or reducing degeneracies with other parameters. We find that Nrel = 3.45±0.33 using WMAP 7-years data in combination with South Pole Telescope data and our H(z) determinations (Nrel = 3.71±0.45 using Atacama Cosmology Telescope data instead of South Pole Telescope). We exclude Nrel > 4 at 95% CL (74% CL) using the same datasets combinations. We also put competitive limits on the sum of neutrino masses, Σmν < 0.24 eV at 68% confidence level. These results have been proven to be extremely robust to many possible systematic effects, such as the initial choice of stellar population synthesis model adopted to estimate H(z) and the progenitor-bias.Institute of Physics (IOP)2019201920122019info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion19 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/127551Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2012/07/053Journal of Cosmology and Astroparticle Physics, 2012, vol. 2012, num. 053https://doi.org/10.1088/1475-7516/2012/07/053info:eu-repo/grantAgreement/EC/FP7/240117(c) IOP Publishing and Sissa Medialab, 2012info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1275512026-05-29T05:05:01Z
dc.title.none.fl_str_mv New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
title New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
spellingShingle New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
Moresco, Michele
Expansió de l'univers
Cosmologia
Astrofísica
Expanding universe
Cosmology
Astrophysics
title_short New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
title_full New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
title_fullStr New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
title_full_unstemmed New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
title_sort New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75
dc.creator.none.fl_str_mv Moresco, Michele
Verde, Licia
Pozzetti, Lucia
Jiménez, Raúl (Jiménez Tellado)
Cimatti, Andrea
author Moresco, Michele
author_facet Moresco, Michele
Verde, Licia
Pozzetti, Lucia
Jiménez, Raúl (Jiménez Tellado)
Cimatti, Andrea
author_role author
author2 Verde, Licia
Pozzetti, Lucia
Jiménez, Raúl (Jiménez Tellado)
Cimatti, Andrea
author2_role author
author
author
author
dc.subject.none.fl_str_mv Expansió de l'univers
Cosmologia
Astrofísica
Expanding universe
Cosmology
Astrophysics
topic Expansió de l'univers
Cosmologia
Astrofísica
Expanding universe
Cosmology
Astrophysics
description We have assembled a compilation of observational Hubble parameter measurements estimated with the differential evolution of cosmic chronometers, in the redshift range 0 < z < 1.75. This sample has been used, in combination with CMB data and with the most recent estimate of the Hubble constant H0, to derive new constraints on several cosmological parameters. The new Hubble parameter data are very useful to break some of the parameter degeneracies present in CMB-only analysis, and to constrain possible deviations from the standard (minimal) flat ΛCDM model. The H(z) data are especially valuable in constraining Ωk and ΩDE in models that allow a variation of those parameters, yielding constraints that are competitive with those obtained using Supernovae and/or baryon acoustic oscillations. We also find that our H(z) data are important to constrain parameters that do no affect directly the expansion history, by breaking or reducing degeneracies with other parameters. We find that Nrel = 3.45±0.33 using WMAP 7-years data in combination with South Pole Telescope data and our H(z) determinations (Nrel = 3.71±0.45 using Atacama Cosmology Telescope data instead of South Pole Telescope). We exclude Nrel > 4 at 95% CL (74% CL) using the same datasets combinations. We also put competitive limits on the sum of neutrino masses, Σmν < 0.24 eV at 68% confidence level. These results have been proven to be extremely robust to many possible systematic effects, such as the initial choice of stellar population synthesis model adopted to estimate H(z) and the progenitor-bias.
publishDate 2012
dc.date.none.fl_str_mv 2012
2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/127551
url https://hdl.handle.net/2445/127551
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1088/1475-7516/2012/07/053
Journal of Cosmology and Astroparticle Physics, 2012, vol. 2012, num. 053
https://doi.org/10.1088/1475-7516/2012/07/053
info:eu-repo/grantAgreement/EC/FP7/240117
dc.rights.none.fl_str_mv (c) IOP Publishing and Sissa Medialab, 2012
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) IOP Publishing and Sissa Medialab, 2012
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 19 p.
application/pdf
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:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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