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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ftubarcepubl:oai:diposit.ub.edu:2445/127551 2024-02-11T10:08:40+01:00 New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75 Moresco, Michele Verde, Licia Pozzetti, Lucia Jiménez, Raúl (Jiménez Tellado) Cimatti, Andrea 2012-07 19 p. application/pdf http://hdl.handle.net/2445/127551 eng eng Institute of Physics (IOP) 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 Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) https://doi.org/10.1088/1475-7516/2012/07/053 info:eu-repo/grantAgreement/EC/FP7/240117/EU//PHYS.LSS 1475-7516 http://hdl.handle.net/2445/127551 619876 (c) IOP Publishing and Sissa Medialab, 2012 info:eu-repo/semantics/openAccess Expansió de l'univers Cosmologia Astrofísica Expanding universe Cosmology Astrophysics info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 2012 ftubarcepubl https://doi.org/10.1088/1475-7516/2012/07/053 2024-01-24T01:05:22Z 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. Article in Journal/Newspaper South pole Dipòsit Digital de la Universitat de Barcelona South Pole Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) Journal of Cosmology and Astroparticle Physics 2012 07 053 053 |
institution |
Open Polar |
collection |
Dipòsit Digital de la Universitat de Barcelona |
op_collection_id |
ftubarcepubl |
language |
English |
topic |
Expansió de l'univers Cosmologia Astrofísica Expanding universe Cosmology Astrophysics |
spellingShingle |
Expansió de l'univers Cosmologia Astrofísica Expanding universe Cosmology Astrophysics Moresco, Michele Verde, Licia Pozzetti, Lucia Jiménez, Raúl (Jiménez Tellado) Cimatti, Andrea New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75 |
topic_facet |
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. |
format |
Article in Journal/Newspaper |
author |
Moresco, Michele Verde, Licia Pozzetti, Lucia Jiménez, Raúl (Jiménez Tellado) Cimatti, Andrea |
author_facet |
Moresco, Michele Verde, Licia Pozzetti, Lucia Jiménez, Raúl (Jiménez Tellado) Cimatti, Andrea |
author_sort |
Moresco, Michele |
title |
New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75 |
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 |
publisher |
Institute of Physics (IOP) |
publishDate |
2012 |
url |
http://hdl.handle.net/2445/127551 |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) |
geographic |
South Pole Hubble |
geographic_facet |
South Pole Hubble |
genre |
South pole |
genre_facet |
South pole |
op_relation |
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 Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) https://doi.org/10.1088/1475-7516/2012/07/053 info:eu-repo/grantAgreement/EC/FP7/240117/EU//PHYS.LSS 1475-7516 http://hdl.handle.net/2445/127551 619876 |
op_rights |
(c) IOP Publishing and Sissa Medialab, 2012 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1088/1475-7516/2012/07/053 |
container_title |
Journal of Cosmology and Astroparticle Physics |
container_volume |
2012 |
container_issue |
07 |
container_start_page |
053 |
op_container_end_page |
053 |
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1790608184655740928 |