Abstract
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.
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Alexandrov, S., Fırat, A.H., Kim, M. et al. D-instanton induced superpotential. J. High Energ. Phys. 2022, 90 (2022). https://doi.org/10.1007/JHEP07(2022)090
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DOI: https://doi.org/10.1007/JHEP07(2022)090