%0 Conference Proceedings %T Twistor Approach to String Compactifications %+ Laboratoire Charles Coulomb (L2C) %A Alexandrov, Sergey %F Invité %< avec comité de lecture %Z L2C:12-024 %B Quantum Gravity in Paris %C Paris, France %8 2012-03-26 %D 2012 %Z Physics [physics]/High Energy Physics - Theory [hep-th]Conference papers %X I'll review a progress in obtaining the complete non-perturbative effective action of type II string theory compactified on a Calabi-Yau manifold. This problem is equivalent to understanding quantum corrections to the metric on the hypermultiplet moduli space. We show how all these corrections, which include D-brane and NS5-brane instantons, are incorporated in the framework of the twistor approach, which provides a powerful mathematical description of hyperkahler and quaternion-Kahler manifolds. I'll also present new insights on S-duality, quantum mirror symmetry, connections to integrable models and topological strings. %G English %L hal-00684524 %U https://hal.science/hal-00684524 %~ CNRS %~ L2C %~ MIPS %~ UNIV-MONTPELLIER %~ UM-2015-2021