Undoing decomposition

Abstract

In this paper we discuss gauging one-form symmetries in two-dimensional theories. The existence of a global one-form symmetry in two dimensions typically signals a violation of cluster decomposition -- an issue resolved by the observation that such theories decompose into disjoint unions, a result that has been applied to, for example, Gromov-Witten theory and gauged linear sigma model phases. In this paper we describe how gauging one-form symmetries in two-dimensional theories can be used to select particular elements of that disjoint union, effectively undoing decomposition. We examine such gaugings explicitly in examples involving orbifolds, nonsupersymmetric pure Yang-Mills theories, and supersymmetric gauge theories in two dimensions. Along the way, we learn explicit concrete details of the topological configurations that path integrals sum over when gauging a one-form symmetry, and we also uncover `hidden' one-form symmetries.

50 pages, LaTeX, 2 figures; v2: reference added

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Cited by in corpus (29)

• Symmetries and Strings of Adjoint QCD${}_2$
• Higher Form Symmetries and M-theory
• Modified instanton sum in QCD and higher-groups
• Non-invertible 1-form symmetry and Casimir scaling in 2d Yang-Mills theory
• Decomposition, condensation defects, and fusion
• Duality Defects in $E_8$
• Symmetries and Anomalies of (1+1)d Theories: 2-groups and Symmetry Fractionalization
• Anomaly resolution via decomposition
• Quantum symmetries in orbifolds and decomposition
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