The 3d $A$-model and generalised symmetries, Part I: bosonic Chern-Simons theories

Abstract

The 3d $A$-model is a two-dimensional approach to the computation of supersymmetric observables of three-dimensional $\mathcal{N}=2$ supersymmetric gauge theories. In principle, it allows us to compute half-BPS partition functions on any compact Seifert three-manifold (as well as of expectation values of half-BPS lines thereon), but previous results focussed on the case where the gauge group $\tilde{G}$ is a product of simply-connected and/or unitary gauge groups. We are interested in the more general case of a compact gauge group $G=\tilde{G}/\Gamma$, which is obtained from the $\tilde{G}$ theory by gauging a discrete one-form symmetry. In this paper, we discuss in detail the case of pure $\mathcal{N}=2$ Chern-Simons theories (without matter) for simple groups $G$. When $G=\tilde{G}$ is simply-connected, we demonstrate the exact matching between the supersymmetric approach in terms of Seifert fibering operators and the 3d TQFT approach based on topological surgery in the infrared Chern-Simons theory ${\tilde{G}}_k$, including through the identification of subtle counterterms that relate the two approaches. We then extend this discussion to the case where the Chern-Simons theory $G_k$ can be obtained from ${\tilde{G}}_k$ by the condensation of abelian anyons which are bosonic. Along the way, we revisit the 3d $A$-model formalism by emphasising its 2d TQFT underpinning.

arXiv comment56 pages + appendices; v3: corrected footnote 34, added comments on SU(2) and other small clarifications following referee reports

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Cited by in corpus (1)

• One-form symmetries and the 3d $\mathcal{N}=2$ $A$-model: Topologically twisted indices and CS theories