$C^*$-Tensor Categories in the Theory of $II_1$-Subfactors

Details $C^*$-Tensor Categories in the Theory of $II_1$-Subfactors $C^*$-Tensor Categories in the Theory of $II_1$-Subfactors

1997-01-22

arxiv.org/abs/funct-an/9701007v1

Mathematics

Operator Algebras

58 pages, latex, no figures

Scientific paper

The article contains a detailed description of the connection between finite depth inclusions of $II_1$-subfactors and finite $C^*$-tensor categories (i.e. $C^*$-tensor categories with dimension function for which the number of equivalence classes of irreducible objects is finite). The $(N,N)$-bimodules belonging to a $II_1$-subfactor $N\subset M$ with finite Jones index form a $C^*$-tensor category with dimension function. Conversely, taking an object of a finite $C^*$-tensor category C we construct a subfactor $A\subset R$ of the hyperfinite $II_1$-factor R with finite index and finite depth. For this subfactor we compute the standard invariant and show that the $C^*$-tensor category of the corresponding $(A,A)$-bimodules is equivalent to a subcategory of C. We illustrate the results for the $C^*$-tensor category of the unitary finite dimensional corepresentations of a finite dimensional Hopf-*-algebra.

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