Positive Herz-Schur multipliers and approximation properties of crossed products
Artikel i vetenskaplig tidskrift, 2017

For a C*-algebra A and a set X we give a Stinespring-type characterisation of the completely positive Schur A -multipliers on K(ℓ^2(X))⊗A . We then relate them to completely positive Herz-Schur multipliers on C ∗ -algebraic crossed products of the form A⋊ α,r G , with G a discrete group, whose various versions were considered earlier by Anantharaman-Delaroche, Bedos and Conti, and Dong and Ruan. The latter maps are shown to implement approximation properties, such as nuclearity or the Haagerup property, for A⋊ α,r G .


Andrew McKee

Queen's University Belfast

Adam Skalski

Polish Academy of Sciences

I. G. Todorov

Queen's University Belfast

Lyudmyla Turowska

Göteborgs universitet

Chalmers, Matematiska vetenskaper

Mathematical Proceedings of the Cambridge Philosophical Society

0305-0041 (ISSN) 1469-8064 (eISSN)

Vol. 165 3 511-532




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