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Computing fusion rules for spherical G-extensions of fusion categories

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arxiv 1909.02816 v2 pith:JVS2HND7 submitted 2019-09-06 math.QA math.RT

classification math.QAmath.RT
keywords fusioncategoriesrulesactionextensionextensionsmathcalspherical
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A $G$-graded extension of a fusion category $\mathcal{C}$ yields a categorical action of $G$ on the center $Z(\mathcal C)$. If the extension admits a spherical structure, we provide a method for recovering its fusion rules in terms of the action. We then apply this to find closed formulas for the fusion rules of extensions of some group theoretical categories and of cyclic permutation crossed extensions of modular categories.

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Cited by 1 Pith paper

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  1. Gauging or extending bulk and boundary conformal field theories: Application to bulk and domain wall problem in topological matter and their descriptions by (mock) modular covariant

    hep-th 2024-12 conditional novelty 5.0 of 10

    New classes of boundary and coupled conformal field theories are constructed from Z_N gauging, with a proposed dictionary to topological order, nonchiral anyons, and domain walls.

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