Evaluating backreaction with the ellipsoidal collapse model

Show full item record



Permalink

http://hdl.handle.net/10138/307623

Citation

Montanari , F & Räsänen , S 2017 , ' Evaluating backreaction with the ellipsoidal collapse model ' , Journal of Cosmology and Astroparticle Physics , vol. 2017 , no. 12 , 008 . https://doi.org/10.1088/1475-7516/2017/12/008

Title: Evaluating backreaction with the ellipsoidal collapse model
Author: Montanari, Francesco; Räsänen, Syksy
Contributor organization: Helsinki Institute of Physics
Department of Physics
Date: 2017-12
Language: eng
Number of pages: 30
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
DOI: https://doi.org/10.1088/1475-7516/2017/12/008
URI: http://hdl.handle.net/10138/307623
Abstract: We evaluate the effect of structure formation on the average expansion rate with a statistical treatment where density peaks and troughs are modelled as homogeneous ellipsoids. This extends earlier work that used spherical regions. We find that the shear and the presence of filamentary and planar structures have only a small impact on the results. The expansion rate times the age of the universe Ht increases from 2/3 to 0.83 at late times, in order of magnitude agreement with observations, although the change is slower and takes longer than in the real universe. We discuss shortcomings that have to be addressed for this and similar statistical models in the literature to develop into realistic quantitative treatment of backreaction.
Subject: dark energy theory
gravity
cosmic web
DARK-MATTER HALOES
DENSITY DISTRIBUTION FUNCTION
COSMIC ACCELERATION
GENERAL-RELATIVITY
COSMOLOGICAL PARAMETERS
INHOMOGENEOUS FLUIDS
NEWTONIAN COSMOLOGY
AVERAGE PROPERTIES
DUST COSMOLOGIES
PEAKS FORMALISM
115 Astronomy, Space science
Peer reviewed: Yes
Rights: other
Usage restriction: openAccess
Self-archived version: acceptedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
1710.02451.pdf 915.5Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record