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Evidence for Non-perturbative String Symmetries

John H. Schwarz

hep-tharXiv:hep-th/9411178

Abstract

String theory appears to admit a group of discrete field transformations -- called S dualities -- as exact non-perturbative quantum symmetries. Mathematically, they are rather analogous to the better-known T duality symmetries, which hold perturbatively. In this talk the evidence for S duality is reviewed and some speculations are presented.

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