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. 2007 May 25;98(21):211602.
doi: 10.1103/PhysRevLett.98.211602. Epub 2007 May 24.

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

Daniel Robles-Llana  1 , Martin Rocek, Frank Saueressig, Ulrich Theis, Stefan Vandoren
Affiliations

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

Daniel Robles-Llana et al. Phys Rev Lett. .

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 world sheet instanton corrections into a single modular invariant function that determines the hypermultiplet low-energy effective action.

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