Exact evolution of discrete relativistic cosmological models
2013 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 11, 010- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. no 11, 010- p.
gravity, cosmological simulations, GR black holes
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-99903DOI: 10.1088/1475-7516/2013/11/010ISI: 000327843900011OAI: oai:DiVA.org:su-99903DiVA: diva2:690349
STFC, ST/J001546/1; Erasmus Mundus Joint Doctorate Program from the EACEA of the European Commission, 2011-1640 2014-01-232014-01-202014-09-04Bibliographically approved