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

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Title:	Abelian Chern-Simons theory with toral gauge group, modular tensor categories, and group categories
Author:	Stirling, Spencer
Abstract:	Classical and quantum Chern-Simons with gauge group U(1)N were classified by Belov and Moore in [BM05]. 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 [FK93],[Qui99],[JS93],[ENO05],[DGNO07]. 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.
Department:	Mathematics
Subject:	Quantum field theory Abelian categories Tensor products
URI:	http://hdl.handle.net/2152/17795
Date:	2008-08