On infinite tensor products of projective unitary representations
  We initiate a study of infinite tensor products of projective unitary representations of a discrete group G. Special attention is given to regular representations twisted by 2-cocycles and to projective representations associated with CCR-representations of bilinear maps. Detailed computations are presented in the case where G is a finitely generated free abelian group. We also discuss an extension problem about product type actions of G, where the projective representation theory of G plays a central role. 
Erik Bedos (1), Roberto Conti (2) ((1) University of Oslo, (2)   University of Rome 2)