On kappa-deformed D=4 quantum conformal group

Abstract

This paper is presented on the occasion of 60-th birthday of Jose Adolfo de Azcarraga who in his very rich scientific curriculum vitae has also a chapter devoted to studies of quantum-deformed symmetries, in particular deformations of relativistic and Galilean space-time symmetries [1-4]. In this paper we provide new steps toward describing the $\kappa$-deformed D=4 conformal group transformations. We consider the quantization of D=4 conformal group with dimensionful deformation parameter $\kappa$. Firstly we discuss the noncommutativity following from the Lie-Poisson structure described by the light-cone $\kappa$-Poincar\'{e} $r$-matrix. We present complete set of D=4 conformal Lie-Poisson brackets and discuss their quantization. Further we define the light-cone $\kappa$-Poincar\'{e} quantum $R$-matrix in O(4,2) vector representation and discuss the inclusion of noncommutative conformal translations into the framework of $\kappa$-deformed conformal quantum group. The problem with real structure of $\kappa$-deformed conformal group is pointed out.