Backreaction and spatial curvature in a dust universe
Abstract
It has been recently suggested (in hep-th/0503117) that superhorizon perturbations could explain present-day accelerated expansion. We study the relation between backreaction and spatial curvature using exact equations which do not rely on perturbation theory. We show that the growth of spatial curvature accompanying backreaction-driven acceleration in a dust dominated universe means that the proposal is likely ruled out. We discuss general lessons for a backreaction explanation of late-time acceleration, and note that it will have to involve subhorizon perturbations.Keywords
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