Phys. Rev. Lett. 101, 181101 (2008) [4 pages]Cosmic Inhomogeneities and Averaged Cosmological DynamicsReceived 30 June 2008; published 28 October 2008 If general relativity (GR) describes the expansion of the Universe, the observed cosmic acceleration implies the existence of a “dark energy.” However, while the Universe is on average homogeneous on large scales, it is inhomogeneous on smaller scales. While GR governs the dynamics of the inhomogeneous Universe, the averaged homogeneous Universe obeys modified Einstein equations. Can such modifications alone explain the acceleration? For a simple generic model with realistic initial conditions, we show the answer to be “no.” Averaging effects negligibly influence the cosmological dynamics. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.181101
DOI:
10.1103/PhysRevLett.101.181101
PACS:
98.80.Jk, 04.20.−q
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