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Dualities and fivebrane instantons
We derive the fivebrane instanton corrections to the hypermultiplet moduli space $$ {\mathrm{\mathcal{M}}}_H $$ of Calabi-Yau string vacua using S-duality symmetry of the type IIB formulation. The result is given in terms of a set of holomorphic functions on the twistor space of $$ {\mathrm{\mathcal{M}}}_H $$ . It contains not …