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Average expansion rate and light propagation in a cosmological Tardis spacetime
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Average expansion rate and light propagation in a cosmological Tardis spacetime
Bibliographic description
| title: | Average expansion rate and light propagation in a cosmological Tardis spacetime |
| author: | Lavinto Mikko, Räsänen Syksy, Szybka Sebastian 
|
| journal title: | Journal of Cosmology and Astroparticle Physics |
| volume: | 2013 |
| issue: | 12 |
| date of publication : | 2013 |
| article ID: | 051 |
| eISSN: |
1475-7516 |
| DOI: | |
| language: | English |
| journal language: | English |
| abstract in English: | 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. |
| keywords in English: | dark energy theory, gravity |
| affiliation: | Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne |
| type: | journal article |
| subtype: | academic paper |
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Projekt „Repozytorium otwartego dostępu do dorobku naukowego i dydaktycznego UJ” współfinansowany w ramach poddziałania 2.3.1 „Cyfrowe udostępnianie zasobów nauki” Programu Operacyjnego Polska Cyfrowa z Europejskiego Funduszu Rozwoju Regionalnego i budżetu państwa na podstawie umowy o dofinansowanie nr POPC.02.03.01-00-0030/17-00
