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hep-th2007★ 55 cited
The algebra of Wilson-'t Hooft operators
Anton Kapustin, Natalia Saulina
We study the Operator Product Expansion of Wilson-'t Hooft operators in a twisted N=4 super-Yang-Mills theory with gauge group G. The Montonen-Olive duality puts strong constraints…
hep-th2006★ 54 cited
Electric-Magnetic Duality And The Geometric Langlands Program
Anton Kapustin, Edward Witten
The geometric Langlands program can be described in a natural way by compactifying on a Riemann surface C a twisted version of N=4 super Yang-Mills theory in four dimensions. The k…