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
Abstract
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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