String cosmology and dilaton
  We discuss some aspects of string cosmology with an emphasis on the role played by the dilaton.   A cosmological scenario based on the assumption that all spatial dimensions are periodic so that winding modes play an important role is reviewed. A possibility of a transition from a `string phase' to the `standard' cosmology via a radiation dominated era and inflation is analysed. We also summarise some recent results about time dependent solutions of tree level string equations. 
A.A. Tseytlin