Homology of free quantum groups

Details Homology of free quantum groups Homology of free quantum groups

2009-03-10

arxiv.org/abs/0903.1686v1

Comptes rendus - Mathematique 347 (2009), pp. 271-276

Mathematics

Operator Algebras

8 pages

Scientific paper

10.1016/j.crma.2009.01.021

We compute the Hochschild homology of the free orthogonal quantum group $A_o(n)$. We show that it satisfies Poincar\'e duality and should be considered to be a 3-dimensional object. We then use recent results of R. Vergnioux to derive results about the $\ell^2$-homology of $A_o(n)$ and estimates on the free entropy dimension of its set of generators. In particular, we show that the $\ell^2$ Betti-numbers of $A_o(n)$ all vanish and that the free entropy dimension is less than 1.

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