Factorization of completely bounded maps through reflexive operator spaces with applications to weak almost periodicity

Details Factorization of completely bounded maps through reflexive operator spaces with applications to weak almost periodicity Factorization of completely bounded maps through reflexive operator spaces with applications to weak almost periodicity

2011-04-19

arxiv.org/abs/1104.3812v2

J. Math. Anal. Appl. 385 (2012), 477-484

Mathematics

Functional Analysis

14 pages; minor corrections

Scientific paper

Let $(M,\Gamma)$ be a Hopf--von Neumann algebra, so that $M_\ast$ is a completely contractive Banach algebra. We investigate whether the product of two elements of $M$ that are both weakly almost periodic functionals on $M_\ast$ is again weakly almost periodic. For that purpose, we establish the following factorization result: If $M$ and $N$ are injective von Neumann algebras, and if $x, y \in M \bar{\otimes} N$ correspond to weakly compact operators from $M_\ast$ to $N$ factoring through reflexive operator spaces $X$ and $Y$, respectively, then the operator corresponding to $xy$ factors through the Haagerup tensor product $X \otimes^h Y$ provided that $X \otimes^h Y$ is reflexive. As a consequence, for instance, for any Hopf--von Neumann algebra $(M,\Gamma)$ with $M$ injective, the product of a weakly almost periodic element of $M$ with a completely almost periodic one is again weakly almost periodic.

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