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arXiv 2103.06216math.OAmath.QA
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关于紧量子群上类函数的von Neumann algebra

On the von Neumann algebra of class functions on a compact quantum group

Jacek Krajczok, Mateusz Wasilewski

摘要:

研究了紧量子群中自由群因子中的径向子代数(称为类函数代数)的类似问题。对于自由正交量子群,只要我们处于非Kac情形,我们就证明它们不是MASA。对我们目前的工作来说,最重要的概念是(拟)分裂包含。证明了某些酉量子群的类函数代数的包含是拟分裂的,在这种情况下,子代数是非交换的,并得到了关于其相对交换子的一个结果.在正方向上,我们构造了量子群$SU_q(2)$的某些双交叉积,其中类函数的代数是MASA。

英文摘要:

We study analogues of the radial subalgebras in free group factors (called the algebras of class functions) in the setting of compact quantum groups. For the free orthogonal quantum groups we show that they are not MASAs, as soon as we are in a non-Kac situation. The most important notion to our present work is that of a (quasi-)split inclusion. We prove that the inclusion of the algebra of class functions is quasi-split for some unitary quantum groups; in this case the subalgebra is non-abelian and we also obtain a result concerning its relative commutant. In the positive direction, we construct certain bicrossed products from the quantum group $SU_q(2)$ for which the algebra of class functions is a MASA.

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