%0 Conference Proceedings
%T S-duality and fivebrane instantons
%+ Laboratoire Charles Coulomb (L2C)
%A Alexandrov, Sergey
%F Invité
%< avec comité de lecture
%Z L2C:14-140
%B International Symposium Arenshoop
%C Berlin, Germany
%8 2014-08-25
%D 2014
%Z Physics [physics]/High Energy Physics - Theory [hep-th]Conference papers
%X The low-energy effective action of Type II string theory compactified on a Calabi-Yau threefold is determined by the metric on the vector and hypermultiplet moduli spaces. The latter is known to receive instanton corrections coming from D-branes and NS5-branes wrapping cycles on the Calabi-Yau. I'll show how all of them can be nicely incorporated using twistorial techniques. In particular, fivebrane instantons are derived using S-duality of the type IIB formulation. I'll present also a conjecture for the Witten index of 4d N=2 gauge theories inspired by the twistorial description of the hypermultiplet moduli space.
%G English
%L hal-01059619
%U https://hal.science/hal-01059619
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021