Misc,

Abelian Chern-Simons theory with toral gauge group, modular tensor categories, and group categories

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(2008)cite arxiv:0807.2857Comment: 152 pages.

Abstract

Classical and quantum Chern-Simons with gauge group $U(1)^N$ were classified by Belov and Moore in belov_moore. They studied both ordinary topological quantum field theories as well as spin theories. On the other hand a correspondence is well known between ordinary $(2+1)$-dimensional TQFTs and modular tensor categories. We study group categories and extend them slightly to produce modular tensor categories that correspond to toral Chern-Simons. Group categories have been widely studied in other contexts in the literature frolich_kerler,quinn,joyal_street,eno,dgno. The main result is a proof that the associated projective representation of the mapping class group is isomorphic to the one from toral Chern-Simons. We also remark on an algebraic theorem of Nikulin that is used in this paper.

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