(2+1) null-plane quantum Poincar\'e group from a factorized universal   $R$-matrix
  The non-standard (Jordanian) quantum deformations of $so(2,2)$ and (2+1) Poincar\'e algebras are constructed by starting from a quantum $sl(2,\R)$ basis such that simple factorized expressions for their corresponding universal $R$-matrices are obtained. As an application, the null-plane quantum (2+1) Poincar\'e Poisson-Lie group is quantized by following the FRT prescription. Matrix and differential representations of this null-plane deformation are presented, and the influence of the choice of the basis in the resultant $q$-Schr\"odinger equation governing the deformed null plane evolution is commented. 
Angel Ballesteros and Francisco J. Herranz