Small Instantons , del Pezzo Surfaces and Type I ′ theory

@inproceedings{Douglas1997SmallI,
  title={Small Instantons , del Pezzo Surfaces and Type I ′ theory},
  author={Michael R. Douglas and Sheldon Katz and Cumrun Vafa},
  year={1997}
}
Samll instantons of exceptional groups arise geometrically by a collapsing Del Pezzo surface in a CY. We use this to explain the physics of a 4-brane probe in Type I ′ compactification 

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