Singularity Free (Homogeneous Isotropic) Universe in Graviton-Dilaton   Models
  We present a class of graviton-dilaton models in which a homogeneous isotropic universe, such as our observed one, evolves with no singularity at any time. Such models may stand on their own as interesting models for singularity free cosmology, and may be studied further accordingly. They may also arise from string theory. We discuss critically a few such possibilities. 
S. Kalyana Rama