Impact of H_{0} prior on the evidence for dark radiation
Recent analyses that include cosmic microwave background (CMB) anisotropy measurements from the Atacama Cosmology Telescope and the South Pole Telescope have hinted at the presence of a dark radiation component at more than two standard deviations. However, this result depends sensitively on the ass...
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Online Access: | http://hdl.handle.net/11573/488209 https://doi.org/10.1103/physrevd.86.043520 |
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ftunivromairis:oai:iris.uniroma1.it:11573/488209 2024-02-11T10:08:41+01:00 Impact of H_{0} prior on the evidence for dark radiation CALABRESE, ERMINIA MELCHIORRI, Alessandro Maria Archidiacono Ratra Bharat Calabrese, Erminia Maria, Archidiacono Melchiorri, Alessandro Ratra, Bharat 2012 http://hdl.handle.net/11573/488209 https://doi.org/10.1103/physrevd.86.043520 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000307506600009 volume:86 issue:4 firstpage:043520 numberofpages:8 journal:PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY http://hdl.handle.net/11573/488209 doi:10.1103/physrevd.86.043520 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84865079084 info:eu-repo/semantics/article 2012 ftunivromairis https://doi.org/10.1103/physrevd.86.043520 2024-01-17T17:51:08Z Recent analyses that include cosmic microwave background (CMB) anisotropy measurements from the Atacama Cosmology Telescope and the South Pole Telescope have hinted at the presence of a dark radiation component at more than two standard deviations. However, this result depends sensitively on the assumption of an Hubble Space Telescope prior on the Hubble constant, where H0=73.8±2.4 km/s/Mpc at 68% c.l. Here we repeat this kind of analysis assuming a prior of H0=68±2.8 km/s/Mpc at 68% c.l., derived from a median statistics (MS) analysis of 537 non-CMB H0 measurements from Huchra’s compilation. This prior is fully consistent with the value of H0=69.7±2.5 km/s/Mpc at 68% c.l. obtained from CMB measurements under assumption of the standard ΛCDM model. We show that with the MS H0 prior the evidence for dark radiation is weakened to ∼1.2 standard deviations. Parametrizing the dark radiation component through the effective number of relativistic degrees of freedom Neff, we find Neff=3.98±0.37 at 68% c.l. with the Hubble Space Telescope prior and Neff=3.52±0.39 at 68% c.l. with the MS prior. We also discuss the implications for current limits on neutrino masses and on primordial Helium abundances. Article in Journal/Newspaper South pole Sapienza Università di Roma: CINECA IRIS Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) South Pole Physical Review D 86 4 |
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Sapienza Università di Roma: CINECA IRIS |
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ftunivromairis |
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English |
description |
Recent analyses that include cosmic microwave background (CMB) anisotropy measurements from the Atacama Cosmology Telescope and the South Pole Telescope have hinted at the presence of a dark radiation component at more than two standard deviations. However, this result depends sensitively on the assumption of an Hubble Space Telescope prior on the Hubble constant, where H0=73.8±2.4 km/s/Mpc at 68% c.l. Here we repeat this kind of analysis assuming a prior of H0=68±2.8 km/s/Mpc at 68% c.l., derived from a median statistics (MS) analysis of 537 non-CMB H0 measurements from Huchra’s compilation. This prior is fully consistent with the value of H0=69.7±2.5 km/s/Mpc at 68% c.l. obtained from CMB measurements under assumption of the standard ΛCDM model. We show that with the MS H0 prior the evidence for dark radiation is weakened to ∼1.2 standard deviations. Parametrizing the dark radiation component through the effective number of relativistic degrees of freedom Neff, we find Neff=3.98±0.37 at 68% c.l. with the Hubble Space Telescope prior and Neff=3.52±0.39 at 68% c.l. with the MS prior. We also discuss the implications for current limits on neutrino masses and on primordial Helium abundances. |
author2 |
Calabrese, Erminia Maria, Archidiacono Melchiorri, Alessandro Ratra, Bharat |
format |
Article in Journal/Newspaper |
author |
CALABRESE, ERMINIA MELCHIORRI, Alessandro Maria Archidiacono Ratra Bharat |
spellingShingle |
CALABRESE, ERMINIA MELCHIORRI, Alessandro Maria Archidiacono Ratra Bharat Impact of H_{0} prior on the evidence for dark radiation |
author_facet |
CALABRESE, ERMINIA MELCHIORRI, Alessandro Maria Archidiacono Ratra Bharat |
author_sort |
CALABRESE, ERMINIA |
title |
Impact of H_{0} prior on the evidence for dark radiation |
title_short |
Impact of H_{0} prior on the evidence for dark radiation |
title_full |
Impact of H_{0} prior on the evidence for dark radiation |
title_fullStr |
Impact of H_{0} prior on the evidence for dark radiation |
title_full_unstemmed |
Impact of H_{0} prior on the evidence for dark radiation |
title_sort |
impact of h_{0} prior on the evidence for dark radiation |
publishDate |
2012 |
url |
http://hdl.handle.net/11573/488209 https://doi.org/10.1103/physrevd.86.043520 |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) |
geographic |
Hubble South Pole |
geographic_facet |
Hubble South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000307506600009 volume:86 issue:4 firstpage:043520 numberofpages:8 journal:PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY http://hdl.handle.net/11573/488209 doi:10.1103/physrevd.86.043520 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84865079084 |
op_doi |
https://doi.org/10.1103/physrevd.86.043520 |
container_title |
Physical Review D |
container_volume |
86 |
container_issue |
4 |
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1790608240536453120 |