Closed Inhomogeneous String Cosmologies

Abstract

We present a general algorithm which permits to construct solutions in string cosmology for heterotic and type-IIB superstrings in four dimensions. Using a chain of transformations applied in sequence: conformal, T-duality and SL(2,R) rotations, along with the usual generating techniques associated to Geroch transformations in Einstein frame, we obtain solutions with all relevant low-energy remnants of the string theory. To exemplify our algorithm we present an inhomogeneous string cosmology with S^3 topology of spatial sections, discuss some properties of the solution and point out some subtleties involved in the concept of homogeneity and isotropy in string cosmology.

14 pages, TeX harvmac. Some misprints corrected and one reference added

References in corpus (2)

• Inhomogeneous String Cosmologies
• S-duality and Compactification of type IIB Superstring Action

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