D-instanton Induced Superpotential Auteur(s): Alexandrov S., Fırat Atakan Hilmi, Kim Manki, Sen Ashoke, Stefański Bogdan (Article) Publié: Journal Of High Energy Physics, vol. 2022 p.90 (2022) Texte intégral en Openaccess : Ref HAL: hal-03635867_v1 Ref Arxiv: 2204.02981 DOI: 10.1007/JHEP07(2022)090 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote Résumé: We use string field theory to fix the normalization of the D-instanton corrections to the superpotential involving the moduli fields of type II string theory compactified on an orientifold of a Calabi-Yau threefold in the absence of fluxes. We focus on $O(1)$ instantons whose only zero modes are the four bosonic modes associated with translation of the instanton in non-compact directions and a pair of fermionic zero modes associated with the two supercharges broken by the instanton. We work with a generic superconformal field theory and express our answer in terms of the spectrum of open strings on the instanton. We analyse the contribution of multi-instantons of this kind to the superpotential and argue that it vanishes when background fluxes are absent.