Backreaction in the Lemaître–Tolman–Bondi model

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http://hdl.handle.net/10138/310242

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Räsänen , S 2004 , ' Backreaction in the Lemaître–Tolman–Bondi model ' , Journal of Cosmology and Astroparticle Physics , vol. 2004 , no. 11 , pp. 10 . https://doi.org/10.1088/1475-7516/2004/11/010

Title: Backreaction in the Lemaître–Tolman–Bondi model
Author: Räsänen, Syksy
Contributor: University of Helsinki, Department of Physics
Date: 2004-10-24
Language: eng
Number of pages: 1
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/310242
Abstract: We study backreaction analytically using the parabolic Lemaître–Tolman–Bondi universe as a toy model. We calculate the average expansion rate and energy density on two different hypersurfaces and compare the results. We also consider the Hubble law and find that backreaction slows down the expansion if measured with proper time, but speeds it up if measured with energy density.
Subject: 114 Physical sciences
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