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 H_0,...
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Online Access: | http://hdl.handle.net/11585/143258 https://doi.org/10.1088/1475-7516/2012/07/053 http://adsabs.harvard.edu/abs/2012JCAP.07.053M |
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ftunibolognairis:oai:cris.unibo.it:11585/143258 2024-04-14T08:19:45+00:00 New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75 MORESCO, MICHELE ENNIO MARIA CIMATTI, ANDREA Licia Verde Lucia Pozzetti Raul Jimenez Michele Moresco Licia Verde Lucia Pozzetti Raul Jimenez Andrea Cimatti 2012 ELETTRONICO http://hdl.handle.net/11585/143258 https://doi.org/10.1088/1475-7516/2012/07/053 http://adsabs.harvard.edu/abs/2012JCAP.07.053M eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000307079600002 volume:2012 firstpage:053 lastpage:053 numberofpages:18 journal:JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS http://hdl.handle.net/11585/143258 doi:10.1088/1475-7516/2012/07/053 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84864757742 http://adsabs.harvard.edu/abs/2012JCAP.07.053M neutrino masses from cosmology dark energy experiment dark energy theory info:eu-repo/semantics/article 2012 ftunibolognairis https://doi.org/10.1088/1475-7516/2012/07/053 2024-03-21T17:32:01Z 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 H_0, 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 \Lambda CDM model. The H(z) data are especially valuable in constraining \Omega_k and \Omega_DE 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\pm0.33 using WMAP 7-years data in combination with South Pole Telescope data and our H(z) determinations (Nrel=3.71\pm0.45 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, \Sigma m_\nu<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 IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) South Pole Journal of Cosmology and Astroparticle Physics 2012 07 053 053 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
neutrino masses from cosmology dark energy experiment dark energy theory |
spellingShingle |
neutrino masses from cosmology dark energy experiment dark energy theory MORESCO, MICHELE ENNIO MARIA CIMATTI, ANDREA Licia Verde Lucia Pozzetti Raul Jimenez New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe to z~1.75 |
topic_facet |
neutrino masses from cosmology dark energy experiment dark energy theory |
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 H_0, 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 \Lambda CDM model. The H(z) data are especially valuable in constraining \Omega_k and \Omega_DE 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\pm0.33 using WMAP 7-years data in combination with South Pole Telescope data and our H(z) determinations (Nrel=3.71\pm0.45 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, \Sigma m_\nu<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. |
author2 |
Michele Moresco Licia Verde Lucia Pozzetti Raul Jimenez Andrea Cimatti |
format |
Article in Journal/Newspaper |
author |
MORESCO, MICHELE ENNIO MARIA CIMATTI, ANDREA Licia Verde Lucia Pozzetti Raul Jimenez |
author_facet |
MORESCO, MICHELE ENNIO MARIA CIMATTI, ANDREA Licia Verde Lucia Pozzetti Raul Jimenez |
author_sort |
MORESCO, MICHELE ENNIO MARIA |
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 |
publishDate |
2012 |
url |
http://hdl.handle.net/11585/143258 https://doi.org/10.1088/1475-7516/2012/07/053 http://adsabs.harvard.edu/abs/2012JCAP.07.053M |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Hubble Lambda South Pole |
geographic_facet |
Hubble Lambda South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000307079600002 volume:2012 firstpage:053 lastpage:053 numberofpages:18 journal:JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS http://hdl.handle.net/11585/143258 doi:10.1088/1475-7516/2012/07/053 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84864757742 http://adsabs.harvard.edu/abs/2012JCAP.07.053M |
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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1796297844222590976 |