Cosmological solutions with dilaton and maximally symmetric space in string theory

Abstract

We discuss time - dependent solutions of the leading order string effective equations for a non-zero central charge deficit and curved maximally symmetric space. Some regular solutions are found for the case of non-trivial antisymmetric tensor and vector backgrounds (in various dimensions) and negative spatial curvature. It remains an open question which conformal theories are exact generalisations of these solutions.

34 pages --------TEX errors finally corrected-------------------

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