Inhomogeneous dusty Universes and their deceleration

Details Inhomogeneous dusty Universes and their deceleration Inhomogeneous dusty Universes and their deceleration

2005-05-24

arxiv.org/abs/hep-th/0505222v2

Phys.Lett. B634 (2006) 1-4

Physics

High Energy Physics

High Energy Physics - Theory

8 pages; minor corrected typos

Scientific paper

10.1016/j.physletb.2006.01.019

Exact results stemming directly from Einstein equations imply that inhomogeneous Universes endowed with vanishing pressure density can only decelerate, unless the energy density of the Universe becomes negative. Recent proposals seem to argue that inhomogeneous (but isotropic) space-times, filled only with incoherent matter,may turn into accelerated Universes for sufficiently late times. To scrutinize these scenarios, fully inhomogeneous Einstein equations are discussed in the synchronous system. In a dust-dominated Universe, the inhomogeneous generalization of the deceleration parameter is always positive semi-definite implying that no acceleration takes place.

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