Free product formulae for quantum permutation groups

Details Free product formulae for quantum permutation groups Free product formulae for quantum permutation groups

2005-03-22

arxiv.org/abs/math/0503461v2

J. Inst. Math. Jussieu 6 (2007), 381-414

Mathematics

Quantum Algebra

31 pages

Scientific paper

Associated to a finite graph $X$ is its quantum automorphism group $G(X)$. We prove a formula of type $G(X*Y)=G(X)*_wG(Y)$, where $*_w$ is a free wreath product. Then we discuss representation theory of free wreath products, with the conjectural formula $\mu (G*_wH)=\mu (G)\boxtimes\mu (H)$, where $\mu$ is the associated spectral measure. This is verified in two situations: one using free probability techniques, the other one using planar algebras.

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