%0 Journal Article
%T D-instantons and twistors: some exact results
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Alexandrov, Sergey
%Z 35 pages, 3 figures, uses JHEP3.cls .
%< avec comité de lecture
%Z 09-002
%@ 1751-8113
%J Journal of Physics A: Mathematical and Theoretical
%I IOP Publishing
%V 42
%P 335402
%8 2009
%D 2009
%Z 0902.2761
%R 10.1088/1751-8113/42/33/335402
%K QUATERNIONIC-KAHLER-MANIFOLDS
%K CALABI-YAU SPACES
%K UNIVERSAL HYPERMULTIPLET
%K HYPERKAHLER METRICS
%K LOOP CORRECTIONS
%K II SUPERSTRINGS
%K GEOMETRY
%K COUPLINGS
%K MODULI
%Z Physics [physics]/High Energy Physics - Theory [hep-th]Journal articles
%X We present some results on instanton corrections to the hypermultiplet moduli space in Calabi-Yau compactifications of type-II string theories. Previously, using twistor methods, only a class of D-instantons (D2-instantons wrapping A-cycles) was incorporated exactly and the rest was treated only linearly. We go beyond the linear approximation and give a set of holomorphic functions which, through a known procedure, capture the effect of D-instantons at all orders. Moreover, we show that for a sector where all instanton charges have vanishing symplectic invariant scalar product, the hypermultiplet metric can be computed explicitly.
%G English
%L hal-00362465
%U https://hal.science/hal-00362465
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2