Free unitary groups are (almost) simple
arXiv:1210.4779 · doi:10.1063/1.4764860
Abstract
We show that the quotients of Wang and Van Daele's universal quantum groups by their centers are simple in the sense that they have no normal quantum subgroups, thus providing the first examples of simple compact quantum groups with non-commutative fusion rings.
7 pages + references; to apear in Journal of Mathematical Physics