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Heterotic String Conformal Field Theory And A-D-E Singularities

Edward Witten

hep-tharXiv:hep-th/9909229

Abstract

We analyze the behavior of the heterotic string near an A-D-E singularity without small instantons. This problem is governed by a strongly coupled worldsheet conformal field theory, which, by a combination of O(alpha') corrections and worldsheet instantons, smooths out the singularities present in the classical geometry.

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