(1) Université de Franche-Comté - Besançon, U.F.R des Sciences et Techniques, Département de Mathématiques, 16 route de , Gray-25030 Besancon Cedex, France
Abstract:
In this paper we prove that the von Neumann algebra generated by q-gaussians is not injective as soon as the dimension of the underlying Hilbert space is greater than 1. Our approach is based on a suitable vector valued Khintchine type inequality for Wick products. The same proof also works for the more general setting of a Yang-Baxter deformation. Our techniques can also be extended to the so called q-Araki-Woods von Neumann algebras recently introduced by Hiai. In this latter case, we obtain the non injectivity under some asssumption on the spectral set of the positive operator associated with the deformation.Mathematics Subject Classification (2000): 46L65, 46L54Revised version: 13 January 2004
