Unitary compact quantum group for complex parameter

Abstract

We consider a particular Hayashi $R$-matrix and using the FRT-bialgebra technique and Woronowicz's method of construction, we construct a concrete compact quantum group $U_{q,Θ}(3)$ for non zero real $q$ and modulus one complex deformation parameters $θ_{ij}$. We then study in detail the irreducible $*$-representations of the $C^*$-algebra $C(U_{q,Θ}(3))$, using the representations associated with the three dimensional noncommutative torus.