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arXiv 0903.2363math.OAmath.QA
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紧量子群上的幂等态及其在U_q(2),SU_q(2),SO_q(3)上的分类

Idempotent states on compact quantum groups and their classification on U_q(2), SU_q(2), and SO_q(3)

Uwe Franz, Adam Skalski, Reiji Tomatsu

摘要:

与局部紧群不同,局部紧量子群上的幂等态不一定是紧量子子群的哈尔态。我们给出了紧致量子群上的幂等态的一个简单的特征,这些幂等态是量子子群上的Haar态。我们还证明了量子群U_q(2),SU_q(2)和SO_q(3)(q在(-1,0)\cup(0,1]中)上的所有幂等态都是以这种方式产生的,并列出了紧量子半群U_0(2),SU_0(2)和SO_0(3)上的幂等态。在附录中,我们基于经典紧李群的表示论,给出了经典紧李群的变形的可协性的一个简短的新证明。

英文摘要:

Unlike for locally compact groups, idempotent states on locally compact quantum groups do not necessarily arise as Haar states of compact quantum subgroups. We give a simple characterisation of those idempotent states on compact quantum groups which do arise as Haar states on quantum subgroups. We also show that all idempotent states on the quantum groups U_q(2), SU_q(2), and SO_q(3) (q in (-1,0) \cup (0,1]) arise in this manner and list the idempotent states on the compact quantum semigroups U_0(2), SU_0(2), and SO_0(3). In the Appendix we provide a short new proof of coamenability of the deformations of classical compact Lie groups based on their representation theory.

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