Multi-Scale Perturbation Theory II: Solutions and Leading-Order Bispectrum in the $Λ$CDM Universe
dc.contributor.author | Gallagher, CS | |
dc.contributor.author | Clifton, T | |
dc.contributor.author | Clarkson, C | |
dc.date.accessioned | 2021-09-10T12:39:52Z | |
dc.date.available | 2021-07-08 | |
dc.date.available | 2021-09-10T12:39:52Z | |
dc.date.issued | 2021-08-20 | |
dc.identifier.issn | 1475-7516 | |
dc.identifier.other | 048 | |
dc.identifier.uri | https://qmro.qmul.ac.uk/xmlui/handle/123456789/73960 | |
dc.description.abstract | Two-parameter perturbation theory (2PPT) is a framework designed to include the relativistic gravitational effects of small-scale nonlinear structures on the large-scale properties of the Universe. In this paper we use the 2PPT framework to calculate and study the bispectrum of matter in a spatially-flat $\Lambda$CDM cosmology. This is achieved by deploying Newtonian perturbation theory to model the gravitational fields of quasi-nonlinear structures, and then subsequently using them as source terms for the large-scale cosmological perturbations. We find that our approach reproduces some of the expected relativistic effects from second-order cosmological perturbation theory, but not all. This work therefore provides a first step in deploying a formalism that can simultaneously model the weak gravitational fields of both linear and nonlinear structures in a realistic model of the Universe. | en_US |
dc.publisher | IOP Publishing | en_US |
dc.relation.ispartof | Journal of Cosmology and Astroparticle Physics | |
dc.rights | Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. | |
dc.rights | Attribution 3.0 United States | * |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/us/ | * |
dc.subject | gr-qc | en_US |
dc.subject | gr-qc | en_US |
dc.subject | astro-ph.CO | en_US |
dc.title | Multi-Scale Perturbation Theory II: Solutions and Leading-Order Bispectrum in the $Λ$CDM Universe | en_US |
dc.type | Article | en_US |
dc.rights.holder | © 2021, The Author(s) | |
dc.identifier.doi | 10.1088/1475-7516/2021/08/048 | |
pubs.author-url | http://arxiv.org/abs/2104.04260v1 | en_US |
pubs.notes | Not known | en_US |
pubs.publication-status | Published | en_US |
pubs.volume | 08 | en_US |
dcterms.dateAccepted | 2021-07-08 | |
rioxxterms.funder | Default funder | en_US |
rioxxterms.identifier.project | Default project | en_US |
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Except where otherwise noted, this item's license is described as Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.