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 abundances 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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ftcern:oai:cds.cern.ch:982351 2023-05-15T18:22:41+02:00 Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys Sefusatti, E Vale, C Kadota, K Frieman, J A 2006-09-05 http://cds.cern.ch/record/982351 eng eng http://cds.cern.ch/record/982351 astro-ph/0609124 FERMILAB-Pub-2006-324-A oai:cds.cern.ch:982351 Astrophysics and Astronomy 2006 ftcern 2018-07-28T08:29:13Z Galaxy cluster surveys will be a powerful probe of dark energy. At the same time, cluster abundances 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. Other/Unknown Material South pole CERN Document Server (CDS) South Pole |
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Astrophysics and Astronomy Sefusatti, E Vale, C Kadota, K Frieman, J A Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys |
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Astrophysics and Astronomy |
description |
Galaxy cluster surveys will be a powerful probe of dark energy. At the same time, cluster abundances 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. |
author |
Sefusatti, E Vale, C Kadota, K Frieman, J A |
author_facet |
Sefusatti, E Vale, C Kadota, K Frieman, J A |
author_sort |
Sefusatti, E |
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 |
publishDate |
2006 |
url |
http://cds.cern.ch/record/982351 |
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South Pole |
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South Pole |
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South pole |
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http://cds.cern.ch/record/982351 astro-ph/0609124 FERMILAB-Pub-2006-324-A oai:cds.cern.ch:982351 |
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1766202087226474496 |