Cosmological Solutions of Type II Superstrings
arXiv:gr-qc/9901052 · doi:10.1016/S0370-2693(99)00319-6
Abstract
We study maximally symmetric cosmological solutions of type II supersymmetric strings in the presence of the exact quartic curvature corrections to the lowest order effective action, including loop and D-instanton effects. We find that, unlike the case of type IIA theories, de Sitter solutions exist for type IIB superstrings, a conclusion that remains valid when higher-curvature corrections are included on the basis of SL(2,Z) invariance.
11 pages, Latex, no figures
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