# World-sheet corrections via D-instantons

@article{Witten2000WorldsheetCV,
title={World-sheet corrections via D-instantons},
author={Edward Witten},
journal={Journal of High Energy Physics},
year={2000},
volume={2000},
pages={030-030}
}
• E. Witten
• Published 7 July 1999
• Physics
• Journal of High Energy Physics
We use a D-instanton or physical gauge approach to re-derive the heterotic string worldsheet instanton contribution to the superpotential in Calabi-Yau compactification. We derive an analogous formula for worldsheet instanton corrections to the moduli space metric in heterotic string or type-I compactification on a K3 surface. In addition, we give a global analysis of the phase of the worldsheet path integral of the heterotic string, showing precisely how the B-field must be interpreted.
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