Classical and quantum time dependent solutions in string theory
  Using the ontological interpretation of quantum mechanics in a particular sense, we obtain the classical behaviour of the scale factor and two scalar fields, derived from a string effective action for the FRW time dependent model. Besides, the Wheeler-DeWitt equation is solved exactly. We speculate that the same procedure could also be applied to S-branes. 
C. Mart\'inez-Prieto, O. Obreg\'on and J. Socorro