Maximally Symmetric Cosmological Solutions of Type II Superstrings

Details Maximally Symmetric Cosmological Solutions of Type II Superstrings Maximally Symmetric Cosmological Solutions of Type II Superstrings

1999-02-19

arxiv.org/abs/gr-qc/9902058v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, Latex, no figures, talk presented at "New Worlds in Astroparticle Physics" 1998, Faro, Portugal

Scientific paper

We study maximally symmetric cosmological solutions of type II supersymmetric strings in the presence of the exact, SL(2,Z)-invariant, higher-curvature corrections to the lowest order effective action. We find that, unlike the case of type IIA theories, de Sitter solutions exist, at all orders in $\alpha'$, for type IIB superstrings, when non-perturbative instanton-effects are included on the basis of SL(2,Z) invariance.

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