Cosmological Solutions of Type II Superstrings
M. C. Bento
TL;DR
This paper investigates cosmological solutions in type II superstring theories, revealing that de Sitter solutions exist in type IIB but not in type IIA, even with higher-curvature corrections and non-perturbative effects.
Contribution
It demonstrates the existence of de Sitter solutions in type IIB superstrings considering exact quartic curvature corrections and SL(2,Z) invariance, contrasting with type IIA.
Findings
De Sitter solutions are present in type IIB superstrings.
Type IIA theories do not admit de Sitter solutions under similar conditions.
Higher-curvature corrections and non-perturbative effects do not eliminate these solutions.
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.
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