Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 23, Issue 6, Pages 1823-1835Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/23/6/001
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We study backreaction in dust universes using exact equations which do not rely on perturbation theory, concentrating on theoretical and observational constraints. In particular, we discuss the recent suggestion (Kolb et al 2005 Preprint hep-th/0503117) that superhorizon perturbations could explain present-day accelerated expansion as a useful example which can be ruled out. We note that a backreaction explanation of late-time acceleration will have to involve spatial curvature and subhorizon perturbations.
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