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Classification of $\mathbb{Z}/2\mathbb{Z}$-quadratic unitary fusion categories

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arxiv 2108.01564 v2 pith:3GVOJE2F submitted 2021-08-03 math.QA math.CTmath.OA

classification math.QAmath.CTmath.OA
keywords mathbbfusiongroupcategoriesclassificationquadraticunitarycomputation
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abstract

A unitary fusion category is called $\mathbb{Z}/2\mathbb{Z}$-quadratic if it has a $\mathbb{Z}/2\mathbb{Z}$ group of invertible objects and one other orbit of simple objects under the action of this group. We give a complete classification of $\mathbb{Z}/2\mathbb{Z}$-quadratic unitary fusion categories. The main tools for this classification are skein theory, a generalization of Ostrik's results on formal codegrees to analyze the induction of the group elements to the center, and a computation similar to Larson's rank-finiteness bound for $\mathbb{Z}/3\mathbb{Z}$-near group pseudounitary fusion categories. This last computation is contained in an appendix coauthored with attendees from the 2014 AMS MRC on Mathematics of Quantum Phases of Matter and Quantum Information.

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  1. Realizing modular data from centers of near-group categories

    math.QA 2024-12 conditional novelty 6.0 of 10

    A new near-group category Z/4Z x Z/4Z+16 is shown to exist, and the condensation of its Drinfeld center realizes a conjectured rank-10 modular data as the center of a rank-4 fusion category.

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