Non-perturbative de Sitter vacua via α' corrections
Abstract
The higher-derivative α' corrections consistent with O(d,d) duality invariance can be completely classified for cosmological, purely time-dependent backgrounds. This result is used to show that there are duality invariant theories featuring string-frame de Sitter vacua as solutions that are non-perturbative in α', thus suggesting that classical string theory may realize de Sitter solutions in an unexpected fashion.
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