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arXiv 1609.01931math.OAmath.CTmath.QA
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自由圈积量子群与子因子的标准不变量

Free wreath product quantum groups and standard invariants of subfactors

Pierre Tarrago, Jonas Wahl

摘要:

通过Vaughan Jones的一个构造,与有限维$C^*$ -代数$A$中的$\mathbb C$的自然包含相关联的二部图$Γ(A)$产生一个平面代数$\mathcal P^{Γ(A)}$ .证明了$\mathcal P^{Γ(A)}$的每个子因式平面子代数是紧致量子群$\mathbb G$在$A$上的唯一确定作用的不动点平面代数.我们使用这个结果介绍了一个概念框架的自由圈积操作紧凑的量子群的语言平面代数/标准不变量的子因子。我们的方法统一了以前的自由圈积的定义,由于Bichon和Fima-Pittau,并将它们扩展到一个相当大的类紧凑的量子群。此外,我们还观察到离散量子群的中心Haagerup性质在自由圈积运算下(在它们的环上)是稳定的,并对Banica和Bichon关于自由圈积的特征标分布的猜想给出了肯定的回答.

英文摘要:

By a construction of Vaughan Jones, the bipartite graph $Γ(A)$ associated with the natural inclusion of $\mathbb C$ inside a finite-dimensional $C^*$-algebra $A$ gives rise to a planar algebra $\mathcal P^{Γ(A)}$. We prove that every subfactor planar subalgebra of $\mathcal P^{Γ(A)}$ is the fixed point planar algebra of a uniquely determined action of a compact quantum group $\mathbb G$ on $A$. We use this result to introduce a conceptual framework for the free wreath product operation on compact quantum groups in the language of planar algebras/standard invariants of subfactors. Our approach unifies both previous definitions of the free wreath product due to Bichon and Fima-Pittau and extends them to a considerably larger class of compact quantum groups. In addition, we observe that the central Haagerup property for discrete quantum groups is stable under the free wreath product operation (on their duals) and we deduce a positive answer to a conjecture of Banica and Bichon on the distribution of the character of a free wreath product.

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