dc.contributor.author | Gallagher, CS | |
dc.contributor.author | Clifton, T | |
dc.contributor.author | Clarkson, C | |
dc.date.accessioned | 2022-08-01T15:49:43Z | |
dc.date.available | 2022-08-01T15:49:43Z | |
dc.date.issued | 2021 | |
dc.identifier.citation | Gallagher, Christopher & Clifton, Timothy & Clarkson, Chris. (2021). Multi-scale perturbation theory II: Solutions and leading-order bispectrum in the ΛCDM universe. Journal of Cosmology and Astroparticle Physics. 2021. 048. 10.1088/1475-7516/2021/08/048. | en_US |
dc.identifier.issn | 1475-7516 | |
dc.identifier.uri | http://iopscience.iop.org/1475-7516 | |
dc.identifier.uri | http://hdl.handle.net/10566/7650 | |
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 ΛCDM 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 secondorder 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.language.iso | en | en_US |
dc.publisher | IOP Publishing | en_US |
dc.subject | cosmological perturbation theory | en_US |
dc.subject | gravity | en_US |
dc.subject | non-gaussianity | en_US |
dc.subject | power spectrum | en_US |
dc.title | Multi-scale perturbation theory II: Solutions and leading-order bispectrum in the ΛcDM universe | en_US |
dc.type | Article | en_US |