The Possibility of Cosmic Acceleration via Spatial Averaging in Lemaitre-Tolman-Bondi Models
arXiv:astro-ph/0605195 · doi:10.1088/0264-9381/23/23/022
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.
15 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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