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arxiv: hep-th/0612027 · v2 · submitted 2006-12-04 · ✦ hep-th

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Nonperturbative corrections to 4D string theory effective actions from SL(2,Z) duality and supersymmetry

Daniel Robles-Llana , Martin Rocek , Frank Saueressig , Ulrich Theis , Stefan Vandoren
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classification ✦ hep-th
keywords correctionseffectivehypermultipletinstantonstringacctionactionscalabi-yau
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We find the D(-1) and D1-brane instanton contributions to the hypermultiplet moduli space of type IIB string compactifications on Calabi-Yau threefolds. These combine with known perturbative and worldsheet instanton corrections into a single modular invariant function that determines the hypermultiplet low-energy effective acction.

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    Higher-derivative corrections explicitly break all hidden symmetry enhancements in the three-dimensional reductions of non-maximal supergravities.