Average expansion rate and light propagation in a cosmological Tardis spacetime

2013
journal article
article
57
dc.abstract.enWe 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.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorLavinto, Mikkopl
dc.contributor.authorRäsänen, Syksypl
dc.contributor.authorSzybka, Sebastian - 102101 pl
dc.date.accessioned2015-06-09T12:46:15Z
dc.date.available2015-06-09T12:46:15Z
dc.date.issued2013pl
dc.description.number12pl
dc.description.volume2013pl
dc.identifier.articleid051pl
dc.identifier.doi10.1088/1475-7516/2013/12/051pl
dc.identifier.eissn1475-7516pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/9148
dc.languageengpl
dc.language.containerengpl
dc.rights.licencebez licencji
dc.subject.endark energy theorypl
dc.subject.engravitypl
dc.subtypeArticlepl
dc.titleAverage expansion rate and light propagation in a cosmological Tardis spacetimepl
dc.title.journalJournal of Cosmology and Astroparticle Physicspl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
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.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Lavinto, Mikko
dc.contributor.authorpl
Räsänen, Syksy
dc.contributor.authorpl
Szybka, Sebastian - 102101
dc.date.accessioned
2015-06-09T12:46:15Z
dc.date.available
2015-06-09T12:46:15Z
dc.date.issuedpl
2013
dc.description.numberpl
12
dc.description.volumepl
2013
dc.identifier.articleidpl
051
dc.identifier.doipl
10.1088/1475-7516/2013/12/051
dc.identifier.eissnpl
1475-7516
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/9148
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights.licence
bez licencji
dc.subject.enpl
dark energy theory
dc.subject.enpl
gravity
dc.subtypepl
Article
dc.titlepl
Average expansion rate and light propagation in a cosmological Tardis spacetime
dc.title.journalpl
Journal of Cosmology and Astroparticle Physics
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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