Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys
Galaxy cluster surveys will be a powerful probe of dark energy. At the same time, cluster abundance is sensitive to any non-Gaussianity of the primordial density field. It is therefore possible that non-Gaussian initial conditions might be misinterpreted as a sign of dark energy or at least degrade...
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ftdatacite:10.48550/arxiv.astro-ph/0609124 2023-05-15T18:22:48+02:00 Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys Sefusatti, Emiliano Vale, Chris Kadota, Kenji Frieman, Joshua 2006 https://dx.doi.org/10.48550/arxiv.astro-ph/0609124 https://arxiv.org/abs/astro-ph/0609124 unknown arXiv https://dx.doi.org/10.1086/511331 Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ Astrophysics astro-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2006 ftdatacite https://doi.org/10.48550/arxiv.astro-ph/0609124 https://doi.org/10.1086/511331 2022-04-01T15:43:14Z Galaxy cluster surveys will be a powerful probe of dark energy. At the same time, cluster abundance is sensitive to any non-Gaussianity of the primordial density field. It is therefore possible that non-Gaussian initial conditions might be misinterpreted as a sign of dark energy or at least degrade the expected constraints on dark energy parameters. To address this issue, we perform a likelihood analysis of an ideal cluster survey similar in size and depth to the upcoming South Pole Telescope/Dark Energy Survey (SPT-DES). We analyze a model in which the strength of the non-Gaussianity is parameterized by the constant fNL; this model has been used extensively to derive Cosmic Microwave Background (CMB) anisotropy constraints on non-Gaussianity, allowing us to make contact with those works. We find that the constraining power of the cluster survey on dark energy observables is not significantly diminished by non-Gaussianity provided that cluster redshift information is included in the analysis. We also find that even an ideal cluster survey is unlikely to improve significantly current and future CMB constraints on non-Gaussianity. However, when all systematics are under control, it could constitute a valuable cross check to CMB observations. : 10 pages, 4 figures. Corrected a minor discrepancy between our earlier definition of fNL and CMB constraints. References added Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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Astrophysics astro-ph FOS Physical sciences |
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Astrophysics astro-ph FOS Physical sciences Sefusatti, Emiliano Vale, Chris Kadota, Kenji Frieman, Joshua Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys |
topic_facet |
Astrophysics astro-ph FOS Physical sciences |
description |
Galaxy cluster surveys will be a powerful probe of dark energy. At the same time, cluster abundance is sensitive to any non-Gaussianity of the primordial density field. It is therefore possible that non-Gaussian initial conditions might be misinterpreted as a sign of dark energy or at least degrade the expected constraints on dark energy parameters. To address this issue, we perform a likelihood analysis of an ideal cluster survey similar in size and depth to the upcoming South Pole Telescope/Dark Energy Survey (SPT-DES). We analyze a model in which the strength of the non-Gaussianity is parameterized by the constant fNL; this model has been used extensively to derive Cosmic Microwave Background (CMB) anisotropy constraints on non-Gaussianity, allowing us to make contact with those works. We find that the constraining power of the cluster survey on dark energy observables is not significantly diminished by non-Gaussianity provided that cluster redshift information is included in the analysis. We also find that even an ideal cluster survey is unlikely to improve significantly current and future CMB constraints on non-Gaussianity. However, when all systematics are under control, it could constitute a valuable cross check to CMB observations. : 10 pages, 4 figures. Corrected a minor discrepancy between our earlier definition of fNL and CMB constraints. References added |
format |
Text |
author |
Sefusatti, Emiliano Vale, Chris Kadota, Kenji Frieman, Joshua |
author_facet |
Sefusatti, Emiliano Vale, Chris Kadota, Kenji Frieman, Joshua |
author_sort |
Sefusatti, Emiliano |
title |
Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys |
title_short |
Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys |
title_full |
Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys |
title_fullStr |
Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys |
title_full_unstemmed |
Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys |
title_sort |
primordial non-gaussianity and dark energy constraints from cluster surveys |
publisher |
arXiv |
publishDate |
2006 |
url |
https://dx.doi.org/10.48550/arxiv.astro-ph/0609124 https://arxiv.org/abs/astro-ph/0609124 |
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South Pole |
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South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1086/511331 |
op_rights |
Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ |
op_doi |
https://doi.org/10.48550/arxiv.astro-ph/0609124 https://doi.org/10.1086/511331 |
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1766202223608463360 |