On `rolling moduli' solutions in string cosmology

Abstract

Given a static string solution with some free constant parameters (`moduli') it may be possible to construct a time-dependent solution by just replacing the moduli by some functions of time. We present several examples when such `rolling moduli' ansatz is consistent. In particular, the anisotropic D=4 cosmological solution of Nappi and Witten can be reinterpreted as a time-dependent generalisation of the (analytic continuation of) D=3 `charged black string' background with the `charge' changing with time. We find some new D=4 cosmological solutions which are `two rolling moduli' generalisations of the previously known ones. We also comment on interplay between duality transformations and the replacement of moduli by functions of time.

14 p., harvmac, Imperial/TP/93-94/36

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Cited by in corpus (14)

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• BPS Branes in Cosmology
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• Cosmology with Radion and Bulk Scalar Field in Two Branes Model
• M-theory resolution of four-dimensional cosmological singularities via U-duality
• Infinity in string cosmology: A review through open problems
• Qualitative Analysis of String Cosmologies
• Duality and Restoration of Manifest Supersymmetry
• Dynamical Topology Change, Compactification and Waves in String Cosmology
• Supersymmetry and Lorentzian holonomy in various dimensions
• One-loop bosonic string and De Sitter space
• Dynamically restoring conformal invariance in (integrable) $\sigma$-models