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We explore maximally supersymmetric Yang-Mills theory with walls ofimpurities respecting half of the supersymmetries. The walls carry fundamentalor bifundamental matter multiplets. We employ three-dimensional N=2 superspacelanguage to identify the Higgs branch of this theory. We find that the vacuumconditions determining the Higgs branch are exactly the bow equations yieldingYang-Mills instantons on a multi-Taub-NUT space.  Under electric-magnetic duality, the super Yang-Mills theory describing thebulk is mapped to itself, while the fundamental- and bifundamental-carryingimpurity walls are interchanged. We perform a one-loop computation on theCoulomb branch of the dual theory to find the asymptotic metric on the originalHiggs branch.

Super Yang-Mills Theory with Impurity Walls and Instanton Moduli Spaces