Abstract
We study 5d N=2 maximally supersymmetric Yang-Mills theory with a gauge group
G on S^2 x M\_3, where M\_3 is a 3-manifold. By explicit localization computation
we show that the path-integral of the 5d N=2 theory reduces to that of the 3d
G\_C Chern-Simons theory on M\_3, where G\_C is the complexification of G. This
gives a direct derivation of the appearance of the Chern-Simons theory from the
compactification of the 6d (2,0) theory, confirms the predictions from the
3d/3d correspondence for G=SU(N), and suggests the generalization of the
correspondence to more general gauge groups.
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