Interface line operators in SYM theories and supersymmetric indices
arXiv:2510.25168 · doi:10.1007/JHEP02(2026)104
Abstract
We study configurations of two super Yang-Mills theories of unitary gauge groups connected by the BPS interfaces involving line operators. We find strong evidence of S-duality of the configurations as precise matching of the line defect half-indices which enumerate the BPS local operators at the junctions of the interfaces and line operators. The interface line defect half-indices are expressible as intriguing closed-form formulae involving the -binomial coefficients and the principal specializations of the Schur functions.
48 pages, 1 figure, v2: published version in JHEP
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