Mirror symmetry and line operators

Abstract

We study half-BPS line operators in 3d N=4 gauge theories, focusing in particular on the algebras of local operators at their junctions. It is known that there are two basic types of such line operators, distinguished by the SUSY subalgebras that they preserve; the two types can roughly be called "Wilson lines" and "vortex lines", and are exchanged under 3d mirror symmetry. We describe a large class of vortex lines that can be characterized by basic algebraic data, and propose a mathematical scheme to compute the algebras of local operators at their junctions --- including monopole operators --- in terms of this data. The computation generalizes mathematical and physical definitions/analyses of the bulk Coulomb-branch chiral ring. We fully classify the junctions of half-BPS Wilson lines and of half-BPS vortex lines in abelian gauge theories with sufficient matter. We also test our computational scheme in a non-abelian quiver gauge theory, using a 3d-mirror-map of line operators from work of Assel and Gomis.

arXiv comment117 pages + appendices; v2 added references, corrected typo in (C.31); v3 references and many small clarifications added; typos fixed; v4 minor edits to appendix C; v5 minor typos fixed, references clarified

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• Generalized Symmetries and Anomalies of 3d N=4 SCFTs
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• 3d $\mathcal{N}=4$ mirror symmetry with 1-form symmetry
• BFN Springer Theory
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