Singularities: does matter matter?. Gravitational collapse and singularities Homogeneous anisotropic spacetimes Vacuum Stiff fluid Scalar field with exponential potential. Gravitational collapse and singularities.
(DG PRL 93, 161101 (2004))
(DG and Josh Curtis
PRD 72, 064003 (2005))
Similar behavior, except that there is a last bounce.
(DG, F. Pretorius, W. Lim, P. Steinhardt, in progress)
Such potentials are used in the cyclic universe scenario of Steinhardt and Turok.
Does the universe become homogeneous as the singularity is approached?
Yes, the spacetime becomes homogeneous and isotropic.