Cosmological solutions in string theories

@article{Lu1997CosmologicalSI,
  title={Cosmological solutions in string theories},
  author={H. Q. Lu and Sudipta Mukherji and C N Pope and K.-W. Xu},
  journal={Physical Review D},
  year={1997},
  volume={55},
  pages={7926-7935}
}
We obtain a large class of cosmological solutions in the toroidally compactified low-energy limits of string theories in D dimensions. We consider solutions where a p-dimensional subset of the spatial coordinates, parametrizing a flat space, a sphere, or a hyperboloid, describes the spatial sections of the physically observed Universe. The equations of motion reduce to Liouville or SL(N+1,R) Toda equations, which are exactly solvable. We study some of the cases in detail, and find that under… 
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