Classifying fusion categories $\otimes$-generated by an object of small Frobenius-Perron dimension
Abstract
The goal of this paper is to classify fusion categories -generated by a -normal object (defined in this paper) of Frobenius-Perron dimension less than 2. This classification has recently become accessible due to a result of Morrison and Snyder, showing that any such category must be a cyclic extension of a category of adjoint type. Our main tools in this classification are the results of Etingof, Ostrik, and Nikshych, classifying cyclic extensions of a given category in terms of data computed from the Brauer-Picard group, and Drinfeld centre of that category, and the results of the author, which compute the Brauer-Picard group and Drinfeld centres of the categories of adjoint type. Our classification includes the expected categories, constructed from cyclic groups and the categories of type. More interestingly we have categories in our classification that are non-trivial de-equivariantizations of these expected categories. Most interesting of all, our classification includes three infinite families constructed from the exceptional quantum subgroups of , and of .
Keywords
Cite
@article{arxiv.1810.05717,
title = {Classifying fusion categories $\otimes$-generated by an object of small Frobenius-Perron dimension},
author = {Cain Edie-Michell},
journal= {arXiv preprint arXiv:1810.05717},
year = {2020}
}
Comments
41 pages, final version. Revisions on suggestion of referee. To appear in Selecta Mathematica