Backreaction in late-time cosmology

Abstract

We review the effect of the formation of nonlinear structures on the expansion rate, spatial curvature and light propagation in the universe, focusing on the possibility that it could explain cosmological observations without the introduction of dark energy or modified gravity. We concentrate on explaining the relevant physics and highlighting open questions.

33 pages, 2 figures, invited review for Annual Review of Nuclear and Particle Science. v2: Updated to closer match published version. Added references, better editing

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