Abstract
The map between the moduli space of F-theory (or type 11 string) compactifications and heterotic string compactifications can be considerably simplified by using “stable degenerations”. We discuss how this method applies to both the E 8 × E 8 and the Spin(32)/ Z 2 heterotic string. As a simple application of the method we derive some basic properties of the non-perturbative physics of collections of E 8 or Spin(32)/ Z 2 point-like instantons sitting at ADE singularities on a K3 surface.
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