String gas cosmology

@article{Battefeld2006StringGC,
  title={String gas cosmology},
  author={Thorsten J. Battefeld and Scott Watson},
  journal={Reviews of Modern Physics},
  year={2006},
  volume={78},
  pages={435-454}
}
A critical review and summary of string gas cosmology is presented. A pedagogical derivation of the effective action starting from string theory, emphasizing the necessary approximations that must be invoked, is included. Working in the effective theory, that at late times it is not possible to stabilize the extra dimensions by a gas of massive string winding modes is demonstrated. Additional string gases are considered that contain so-called enhanced symmetry states. These string gases are… 

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