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Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions

Matteo Tellarini, Ashley J. Ross, Gianmassimo Tasinato, David Wands

Journal of Cosmology and Astroparticle Physics, Volume: 2016, Issue: 06, Pages: 014 - 014

Swansea University Author: Gianmassimo Tasinato

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Abstract

Measurements of the non-Gaussianity of the primordial density field have the power to considerably improve our understanding of the physics of inflation. Indeed, if we can increase the precision of current measurements by an order of magnitude, a null-detection would rule out many classes of scenari...

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Published in: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
Published: IOP Publishing 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa30107
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first_indexed 2016-09-20T08:58:16Z
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spelling 2020-08-03T10:14:12.7730888 v2 30107 2016-09-19 Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions cb754b073d1e4949c5e3db97744d3301 Gianmassimo Tasinato Gianmassimo Tasinato true false 2016-09-19 SPH Measurements of the non-Gaussianity of the primordial density field have the power to considerably improve our understanding of the physics of inflation. Indeed, if we can increase the precision of current measurements by an order of magnitude, a null-detection would rule out many classes of scenarios for generating primordial fluctuations. Large-scale galaxy redshift surveys represent experiments that hold the promise to realise this goal. Thus, we model the galaxy bispectrum and forecast the accuracy with which it will probe the parameter fNL, which represents the degree of primordial local-type non Gaussianity. Specifically, we address the problem of modelling redshift space distortions (RSD) in the tree-level galaxy bispectrum including fNL. We find novel contributions associated with RSD, with the characteristic large scale amplification induced by local-type non-Gaussianity. These RSD effects must be properly accounted for in order to obtain un-biased measurements of fNL from the galaxy bispectrum. We propose an analytic template for the monopole which can be used to fit against data on large scales, extending models used in the recent measurements. Finally, we perform idealised forecasts on σfNL -- the accuracy of the determination of local non-linear parameter fNL -- from measurements of the galaxy bispectrum. Our findings suggest that current surveys can in principle provide fNL constraints competitive with Planck, and future surveys could improve them further. Journal Article Journal of Cosmology and Astroparticle Physics 2016 06 014 014 IOP Publishing 1475-7516 31 12 2016 2016-12-31 10.1088/1475-7516/2016/06/014 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2020-08-03T10:14:12.7730888 2016-09-19T16:13:04.8007978 College of Science Physics Matteo Tellarini 1 Ashley J. Ross 2 Gianmassimo Tasinato 3 David Wands 4
title Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
spellingShingle Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
Gianmassimo Tasinato
title_short Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
title_full Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
title_fullStr Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
title_full_unstemmed Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
title_sort Galaxy bispectrum, primordial non-Gaussianity and redshift space distortions
author_id_str_mv cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author Gianmassimo Tasinato
author2 Matteo Tellarini
Ashley J. Ross
Gianmassimo Tasinato
David Wands
format Journal article
container_title Journal of Cosmology and Astroparticle Physics
container_volume 2016
container_issue 06
container_start_page 014
publishDate 2016
institution Swansea University
issn 1475-7516
doi_str_mv 10.1088/1475-7516/2016/06/014
publisher IOP Publishing
college_str College of Science
hierarchytype
hierarchy_top_id collegeofscience
hierarchy_top_title College of Science
hierarchy_parent_id collegeofscience
hierarchy_parent_title College of Science
department_str Physics{{{_:::_}}}College of Science{{{_:::_}}}Physics
document_store_str 0
active_str 0
description Measurements of the non-Gaussianity of the primordial density field have the power to considerably improve our understanding of the physics of inflation. Indeed, if we can increase the precision of current measurements by an order of magnitude, a null-detection would rule out many classes of scenarios for generating primordial fluctuations. Large-scale galaxy redshift surveys represent experiments that hold the promise to realise this goal. Thus, we model the galaxy bispectrum and forecast the accuracy with which it will probe the parameter fNL, which represents the degree of primordial local-type non Gaussianity. Specifically, we address the problem of modelling redshift space distortions (RSD) in the tree-level galaxy bispectrum including fNL. We find novel contributions associated with RSD, with the characteristic large scale amplification induced by local-type non-Gaussianity. These RSD effects must be properly accounted for in order to obtain un-biased measurements of fNL from the galaxy bispectrum. We propose an analytic template for the monopole which can be used to fit against data on large scales, extending models used in the recent measurements. Finally, we perform idealised forecasts on σfNL -- the accuracy of the determination of local non-linear parameter fNL -- from measurements of the galaxy bispectrum. Our findings suggest that current surveys can in principle provide fNL constraints competitive with Planck, and future surveys could improve them further.
published_date 2016-12-31T03:51:28Z
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score 10.87192