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Aspects of Non-invertible Symmetry in 2d Quantum Field Theories

Abstract

We construct and study non-invertible symmetries associated with G-graded fusion categories in two-dimensional quantum field theories through three-dimensional symmetry topological field theories enriched by a symmetry group G. We systematically develop the corresponding symmetry-enriched topological orders and investigate how different symmetry fractionalization classes in the three-dimensional theory affect the resulting non-invertible symmetries in two dimensions.