D-instantons in Type IIA string theory on Calabi-Yau threefolds

Sergey Alexandrov , Ashoke Sen , Bogdan Stefański

Type IIA string theory compactified on a Calabi-Yau threefold has a hypermultiplet moduli space whose metric is known to receive non-perturbative corrections from Euclidean D2-branes wrapped on 3-cycles. These corrections have been computed earlier by making use of mirror symmetry, S-duality and twistorial description of quaternionic geometries. In this paper we compute the leading corrections in each homology class using a direct world-sheet approach without relying on any duality symmetry or supersymmetry. Our results are in perfect agreement with the earlier predictions.

Mots clés: D-branes; Nonperturbative Effects; Superstrings and Heterotic Strings

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

Sergey Alexandrov, Ashoke Sen, Bogdan Stefański. D-instantons in Type IIA string theory on Calabi-Yau threefolds. Journal of High Energy Physics, 2021, 2021, pp.18. ⟨10.1007/JHEP11(2021)018⟩. ⟨hal-03319142⟩