The Possibility of Cosmic Acceleration via Spatial Averaging in Lemaitre-Tolman-Bondi Models

Abstract

We investigate the possible occurrence of a positive cosmic acceleration in a spatially averaged, expanding, unbound Lemaitre-Tolman-Bondi cosmology. By studying an approximation in which the contribution of three-curvature dominates over the matter density, we construct numerical models which exhibit acceleration.

arXiv comment15 pages, 5 figures; (v2) figures 2 and 3 corrected, references added, main conclusions remain unchanged; (v3) some clarificatory remarks added, to appear in Class. Quantum Grav

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