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Title: Exact evolution of discrete relativistic cosmological models

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.
Authors:
;  [1] ; ;  [2]
  1. School of Physics and Astronomy, Queen Mary University of London, London (United Kingdom)
  2. Department of Physics, Stockholm University, 106 91 Stockholm (Sweden)
Publication Date:
OSTI Identifier:
22369936
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ANISOTROPY; COSMOLOGICAL MODELS; DIAGRAMS; EVOLUTION; MATTER; RELATIVISTIC RANGE; SINGULARITY; SPACE-TIME; SYMMETRY; UNIVERSE