Constraints on backreaction in dust universes

Details Constraints on backreaction in dust universes Constraints on backreaction in dust universes

2005-04-01

arxiv.org/abs/astro-ph/0504005v4

Class.Quant.Grav. 23 (2006) 1823-1835

Astronomy and Astrophysics

Astrophysics

15 pages, 1 figure. v2: The numbers in observational constraints corrected (no qualitative change), added discussion and refer

Scientific paper

10.1088/0264-9381/23/6/001

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 (in 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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