Representations of quantum permutation algebras

Details Representations of quantum permutation algebras Representations of quantum permutation algebras

2009-01-15

arxiv.org/abs/0901.2331v1

J. Funct. Anal. 257 (2009), 2864-2910

Mathematics

Operator Algebras

48 pages

Scientific paper

We develop a combinatorial approach to the quantum permutation algebras, as Hopf images of representations of type $\pi:A_s(n)\to B(H)$. We discuss several general problems, including the commutativity and cocommutativity ones, the existence of tensor product or free wreath product decompositions, and the Tannakian aspects of the construction. The main motivation comes from the quantum invariants of the complex Hadamard matrices: we show here that, under suitable regularity assumptions, the computations can be performed up to $n=6$.

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