International Mathematics Research Notices Advance Access originally published online on June 17, 2009
International Mathematics Research Notices (2009) 2009:4183-4219, doi:10.1093/imrn/rnp084 published on October 27, 2009
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Fusion Subcategories of Representation Categories of Twisted Quantum Doubles of Finite Groups
1 Department of Mathematics, Texas A&M University, College Station, TX 77843, USA
2 Department of Mathematics and Statistics, University of New Hampshire, Durham, NH 03824, USA
3 Department of Mathematics, Texas A&M University, College Station, TX 77843, USA
Correspondence: Correspondence to be sent to: nikshych{at}math.unh.edu
We describe all fusion subcategories of the representation category
of a twisted quantum double
, where G is a finite group and
is a 3-cocycle on G. In view of the fact that every group-theoretical braided fusion category can be embedded into some
, this gives a complete description of all group-theoretical braided fusion categories. We describe the lattice and give formulas for some invariants of the fusion subcategories of
. We also give a characterization of group-theoretical braided fusion categories as equivariantizations of pointed categories.