Accelerated expansion from structure formation

Details Accelerated expansion from structure formation Accelerated expansion from structure formation

2006-07-27

arxiv.org/abs/astro-ph/0607626v3

JCAP0611:003,2006

Astronomy and Astrophysics

Astrophysics

44 pages, 1 figure. Expanded treatment of topics from the Gravity Research Foundation contest essay astro-ph/0605632. v2: Adde

Scientific paper

10.1088/1475-7516/2006/11/003

We discuss the physics of backreaction-driven accelerated expansion. Using the exact equations for the behaviour of averages in dust universes, we explain how large-scale smoothness does not imply that the effect of inhomogeneity and anisotropy on the expansion rate is small. We demonstrate with an analytical toy model how gravitational collapse can lead to acceleration. We find that the conjecture of the accelerated expansion being due to structure formation is in agreement with the general observational picture of structures in the universe, and more quantitative work is needed to make a detailed comparison.

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