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Construction of two-dimensional topological field theories with non-invertible symmetries

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arxiv 2110.02958 v2 pith:VB46F3R6 submitted 2021-10-06 hep-th cond-mat.str-elmath.CTmath.QA

Construction of two-dimensional topological field theories with non-invertible symmetries

classification hep-th cond-mat.str-elmath.CTmath.QA
keywords tftstopologicalcrossingdefectfieldformulaefunctionsnon-invertible
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We construct the defining data of two-dimensional topological field theories (TFTs) enriched by non-invertible symmetries/topological defect lines. Simple formulae for the three-point functions and the lasso two-point functions are derived, and crossing symmetry is proven. The key ingredients are open-to-closed maps and a boundary crossing relation, by which we show that a diagonal basis exists in the defect Hilbert spaces. We then introduce regular TFTs, provide their explicit constructions for the Fibonacci, Ising and Haagerup $\mathcal{H}_3$ fusion categories, and match our formulae with previous bootstrap results. We end by explaining how non-regular TFTs are obtained from regular TFTs via generalized gauging.

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