, Volume 208, Issue 2, pp 389-394
Date: 12 Jun 2012

An inner amenable group whose von Neumann algebra does not have property Gamma


We construct inner amenable groups G with infinite conjugacy classes and such that the associated II1 factor has no non-trivial asymptotically central elements, i.e. does not have property Gamma of Murray and von Neumann. This solves a problem posed by Effros in 1975.