Abstract
Exact field theory dualities can be implemented by duality domain walls such that passing any operator through the interface maps it to the dual operator. This paper describes the S-duality wall of four-dimensional \( \mathcal{N} \) = 2 SU(N) SQCD with 2N hypermultiplets in terms of fields on the defect, namely three-dimensional \( \mathcal{N} \) = 2 SQCD with gauge group U(N − 1) and 2N flavours, with a monopole superpotential. The theory is self-dual under a duality found by Benini, Benvenuti and Pasquetti, in the same way that T[SU(N)] (the S-duality wall of \( \mathcal{N} \) = 4 super Yang-Mills) is self-mirror. The domain-wall theory can also be realized as a limit of a USp(2N − 2) gauge theory; it reduces to known results for N = 2. The theory is found through the AGT correspondence by determining the braiding kernel of two semi-degenerate vertex operators in Toda CFT.
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Le Floch, B. S-duality wall of SQCD from Toda braiding. J. High Energ. Phys. 2020, 152 (2020). https://doi.org/10.1007/JHEP10(2020)152
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DOI: https://doi.org/10.1007/JHEP10(2020)152