Small instantons in string theory

@inproceedings{Witten1996SmallII,
  title={Small instantons in string theory},
  author={Edward H Witten},
  year={1996}
}
A long-standing puzzle about the heterotic string has been what happens when an instanton shrinks to zero size. It is argued here that the answer at the quantum level is that an extra SU(2) gauge symmetry appears that is supported in the core of the instanton. Thus in particular the quantum heterotic string has vacua with higher rank than is possible in conformal field theory. When k instantons collapse at the same point, the enhanced gauge symmetry is Sp(k). These results, which can be tested… CONTINUE READING

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