Nonperturbative corrections to 4D string theory effective actions from SL(2,Z) duality and supersymmetry.
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.
Institute for Theoretical Physics and Spinoza Institute, Utrecht University, 3508 TD Utrecht, The Netherlands.
Daniel
D
Robles-Llana
Martin
M
Rocek
Frank
F
Saueressig
Ulrich
U
Theis
Stefan
S
Vandoren