Twisting the q-deformations of compact semisimple Lie groups

Given a compact semisimple Lie group $G$ of rank $r$, and a parameter $q>0$, we can define new associativity morphisms in Rep(Gq) using a 3-cocycle $Φ$ on the dual of the center of G, thus getting a new tensor category Rep(Gq)$^Φ$. For a class of cocycles $Φ$ we construct compact quantum groups $G^τ_q$ with representation categories Rep(Gq)$^Φ$. The construction depends on the choice of an r-tuple $τ$ of elements in the center of G. In the simplest case of G=SU(2) and $τ=-1$, our construction produces Woronowicz's quantum group SU_{-q}(2) out of SUq(2). More generally, for G=SU(n), we get quantum group realizations of the Kazhdan-Wenzl categories.

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