Cosmological Solutions of Type II
نویسنده
چکیده
We study maximally symmetric cosmological solutions of type II supersym-metric 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.
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تاریخ انتشار 1999