Group-type subfactors and Hadamard matrices

Details Group-type subfactors and Hadamard matrices Group-type subfactors and Hadamard matrices

2008-11-08

arxiv.org/abs/0811.1265v1

Mathematics

Operator Algebras

51 pages

Scientific paper

A hyperfinite $II_1$ subfactor may be obtained from a symmetric commuting square via iteration of the basic construction. For certain commuting squares constructed from Hadamard matrices, we describe this subfactor as a group-type inclusion $R^H \subset R \rtimes K$, where $H$ and $K$ are finite groups with outer actions on the hyperfinite $II_1$ factor $R$. We find the group of outer automorphisms generated by $H$ and $K$, and use the method of Bisch and Haagerup to determine the principal and dual principal graphs. In some cases a complete classification is obtained by examining the element of $H^3(H \ast K / Int R)$ associated with the action.

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