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Fivebrane instantons in Calabi-Yau compactifications
We provide the last missing piece of the complete nonperturbative description of the low energy effective action emerging from Calabi-Yau compactifications of type II string theory---NS5-brane instanton corrections to the hypermultiplet moduli space ${\mathcal{M}}_{H}$. We find them using S-duality symmetry of the type IIB formulation. The result is encoded in …