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World-Sheet Corrections Via D-Instantons

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arxiv hep-th/9907041 v1 pith:AVZILILW submitted 1999-07-07 hep-th

World-Sheet Corrections Via D-Instantons

classification hep-th
keywords heteroticstringworldsheetcompactificationcorrectionsinstantonadditionanalogous
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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