Average expansion rate and light propagation in a cosmological Tardis spacetime

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http://hdl.handle.net/10138/310428

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Lavinto , M , Räsänen , S & Szybka , S 2013 , ' Average expansion rate and light propagation in a cosmological Tardis spacetime ' , Journal of Cosmology and Astroparticle Physics , vol. 2013 , no. 12 , 051 . https://doi.org/10.1088/1475-7516/2013/12/051

Title: Average expansion rate and light propagation in a cosmological Tardis spacetime
Author: Lavinto, Mikko; Räsänen, Syksy; Szybka, Sebastian
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
Date: 2013-12-01
Language: eng
Number of pages: 36
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/310428
Abstract: We construct the first exact statistically homogeneous and isotropic cosmological solution in which inhomogeneity has a significant effect on the expansion rate. The universe is modelled as a Swiss Cheese, with dust FRW background and inhomogeneous holes. We show that if the holes are described by the quasispherical Szekeres solution, their average expansion rate is close to the background under certain rather general conditions. We specialise to spherically symmetric holes and violate one of these conditions. As a result, the average expansion rate at late times grows relative to the background, i.e. backreaction is significant. The holes fit smoothly into the background, but are larger on the inside than a corresponding background domain: we call them Tardis regions. We study light propagation, find the effective equations of state and consider the relation of the spatially averaged expansion rate to the redshift and the angular diameter distance.
Subject: 114 Physical sciences
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