Average expansion rate and light propagation in a cosmological Tardis spacetime

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dc.contributor.author Lavinto, Mikko
dc.contributor.author Räsänen, Syksy
dc.contributor.author Szybka, Sebastian
dc.date.accessioned 2020-01-27T12:22:01Z
dc.date.available 2020-01-27T12:22:01Z
dc.date.issued 2013-12-01
dc.identifier.citation 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
dc.identifier.other PURE: 34369303
dc.identifier.other PURE UUID: 6438a888-b20e-4f24-b63a-0970df2d02f4
dc.identifier.other WOS: 000329609000050
dc.identifier.other Scopus: 84891861122
dc.identifier.other ORCID: /0000-0003-2296-302X/work/29471580
dc.identifier.uri http://hdl.handle.net/10138/310428
dc.description.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. en
dc.format.extent 36
dc.language.iso eng
dc.relation.ispartof Journal of Cosmology and Astroparticle Physics
dc.rights other
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.title Average expansion rate and light propagation in a cosmological Tardis spacetime en
dc.type Article
dc.contributor.organization Helsinki Institute of Physics
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1088/1475-7516/2013/12/051
dc.relation.issn 1475-7516
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion
dc.identifier.url http://arxiv.org/abs/1308.6731

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