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2 results

  • 24 - Full crossed products and failure of WEP for B ⊗min B

  • Gilles Pisier, Texas A & M University
  • Book:
    Tensor Products of <I>C</I>*-Algebras and Operator Spaces
    Published online:
    10 February 2020
    Print publication:
    27 February 2020, pp 410-433

  • Summary

    This chapter is devoted to the proof of two new characterizations of the WEP. This mostly consists of unpublished work due to the late Uffe Haagerup. Basically, the main point is as follows: consider an inclusion of a C*-algebra A into another (larger) one B. We wish to understand when there is a contractive projection from the bidual of B onto the bidual of A. From work presented earlier, we know that this holds if and only if the inclusion from A to B remains an inclusion if we tensorize it with any auxiliary C*-algebra C for the maximal tensor product. The main theorem of this chapter shows that actually a much weaker property suffices: it is enough to take for C the complex conjugate of A and we may restrict to « positive definite » tensors. The main case of interest is when B=B(H), in which case the property in question holds iff A has the WEP. Among the corollaries, one can prove that a von Neumann subalgebra of B(H) is injective as soon as there is a c.b. projection from B(H) onto it.

  • The maximal injective crossed product

  • Part of
  • ALCIDES BUSS, SIEGFRIED ECHTERHOFF, RUFUS WILLETT
  • Journal:
    Ergodic Theory and Dynamical Systems / Volume 40 / Issue 11 / November 2020
    Published online by Cambridge University Press:
    22 April 2019, pp. 2995-3014
    Print publication:
    November 2020
    • Article
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  • A crossed product functor is said to be injective if it takes injective morphisms to injective morphisms. In this paper we show that every locally compact group $G$ admits a maximal injective crossed product $A\mapsto A\rtimes _{\text{inj}}G$. Moreover, we give an explicit construction of this functor that depends only on the maximal crossed product and the existence of $G$-injective $C^{\ast }$-algebras; this is a sort of ‘dual’ result to the construction of the minimal exact crossed product functor, the latter having been studied for its relationship to the Baum–Connes conjecture. It turns out that $\rtimes _{\text{inj}}$ has interesting connections to exactness, the local lifting property, amenable traces, and the weak expectation property.