Heterotic string conformal field theory and ADE singularities

  title={Heterotic string conformal field theory and ADE singularities},
  author={Edward H Witten},
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(α′) corrections and worldsheet instantons, smooths out the singularities present in the classical geometry. 
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