Instantons and seven-branes in type IIB superstring theory
Gary W. Gibbons, Michael B. Green, Malcolm J. Perry
Abstract
Instanton and seven-brane solutions of type IIB supergravity carrying charges in the Ramond-Ramond sector are constructed. The singular seven-brane has a quantized \ magnetic' charge whereas its dual is the instanton, which is non-singular in the string frame and has an associated global electric' charge. The product of these charges is constrained by a Dirac quantization condition. The instanton has the form of a space-time wormhole in the string frame, and is responsible for the non-conservation of the Noether current.
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