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Exact Evolution of Discrete Relativistic Cosmological Models

Authors
  • Clifton, Timothy
  • Gregoris, Daniele
  • Rosquist, Kjell
  • Tavakol, Reza
Type
Published Article
Publication Date
Nov 07, 2013
Submission Date
Sep 11, 2013
Identifiers
DOI: 10.1088/1475-7516/2013/11/010
Source
arXiv
License
Yellow
External links

Abstract

We study the effects of inhomogeneities on the evolution of the Universe, by considering a range of cosmological models with discretized matter content. This is done using exact and fully relativistic methods that exploit the symmetries in and about submanifolds of spacetimes that themselves possess no continuous global symmetries. These methods allow us to follow the evolution of our models throughout their entire history, far beyond what has previously been possible. We find that while some space-like curves collapse to anisotropic singularities in finite time, others remain non-singular forever. The resulting picture is of a cosmological spacetime in which some behaviour remains close to Friedmann-like, while other behaviours deviate radically. In particular, we find that large-scale acceleration is possible without any violation of the energy conditions.

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