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arXiv · hep-th/9502007

Anisotropic space-times in homogeneous string cosmology

N. A. Batakis·A. A. Kehagias
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Abstract

The dynamics of the early universe may have been profoundly influenced by spatial anisotropies. A search for such backgrounds in the context of string cosmology has uncovered the existence of an entire class of (spatatially) homogeneous but not necessarily isotropic space-times, analogous to the class of Bianchi-types in general relativity. Configurations with vanishing cosmological constant but non-vanishing dilaton and antisymmetric field are explicitly found for all types. This is a new class of solutions, whose isotropy limits reproduce all known and, further, all possible FRW-type of models in the string-cosmology context considered. There is always an initial singularity and no inflation. Other features of the general solutions, including their behaviour under abelian duality are are also discussed.

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N. A. Batakis, A. A. Kehagias. 1995-02-01. Anisotropic space-times in homogeneous string cosmology. https://doi.org/10.1016/0550-3213(95)00249-r

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