Cosmological Solutions of Higher-Curvature String Effective Theories with Dilatons

Abstract

We study the effect of higher-curvature terms in the string low-energy effective actions on the cosmological solutions of the theory, up to corrections quartic in the curvatures, for the bosonic and heterotic strings as well as the type II superstring. We find that cosmological solutions exist for all string types but they always disappear when the dilaton field is included, a conclusion that can be avoided if string-loop effects are taken into account.

7 pages, plain Tex with panda.tex macro (included), no figures

References in corpus (1)

• The String Dilaton and a Least Coupling Principle

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