A numerical simulation of pre-big bang cosmology
  We analyse numerically the onset of pre-big bang inflation in an inhomogeneous, spherically symmetric Universe. Adding a small dilatonic perturbation to a trivial (Milne) background, we find that suitable regions of space undergo dilaton-driven inflation and quickly become spatially flat ($\Omega \to 1$). Numerical calculations are pushed close enough to the big bang singularity to allow cross checks against previously proposed analytic asymptotic solutions. 
J. Maharana (CERN and Istitute of Physics, Bhubaneswar, India), E.   Onofri (INFN and Dipartimento di Fisica, Universita` di...