Inhomogeneity implies Accelerated Expansion
  The Einstein equations for an inhomogeneous irrotational dust universe are
analysed. A set of mild assumptions, all of which are shared by the standard
FLRW type scenarios, results in a model that depends only on the distribution
of scalar spatial curvature. If the shape of this distribution is made to fit
the structure of the present universe, with most of the matter in galaxy
clusters and very little in the voids that will eventually dominate the volume,
then there is a period of accelerated expansion after cluster formation, even
in the absence of a cosmological constant.
