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Small Instantons, del Pezzo Surfaces and Type I' theory

M. R. Douglas, S. Katz, C. Vafa

hep-tharXiv:hep-th/9609071

Abstract

Small 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 to 9 dimensions.

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