Hypermultiplet metric and D-instantons

Sergey Alexandrov (1) , Sibasish Banerjee (1)

1 L2C - Laboratoire Charles Coulomb

We use the twistorial construction of D-instantons in Calabi-Yau compactifications of type II string theory to compute an explicit expression for the metric on the hypermultiplet moduli space affected by these non-perturbative corrections. In this way we obtain an exact quaternion-Kahler metric which is a non-trivial deformation of the local c-map. In the four-dimensional case corresponding to the universal hypermultiplet, our metric fits the Tod ansatz and provides an exact solution of the continuous Toda equation. We also analyze the fate of the curvature singularity of the perturbative metric by deriving an S-duality invariant equation which determines the singularity hypersurface after inclusion of the D(-1)-instanton effects.

Mots clés: D-branes; Superstring Vacua; String Duality

Domaines: Physique des Hautes Energies - Théorie [hep-th]

Sergey Alexandrov, Sibasish Banerjee. Hypermultiplet metric and D-instantons. Journal of High Energy Physics, 2015, 2, pp.176. ⟨10.1007/JHEP02(2015)176⟩. ⟨hal-01099930⟩