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Affine sl(N)conformal blocks from $ \mathcal{N} = 2 $ SU(N) gauge theories
Recently Alday and Tachikawa [1] proposed a relation between conformal blocks in a two-dimensional theory with affine sl(2) symmetry and instanton partition functions in four-dimensional conformal $ \mathcal{N} = 2 $ SU(2) quiver gauge theories in the presence of a certain surface operator. In this paper we extend this proposal …