Matrices of unitary moments

Details Matrices of unitary moments Matrices of unitary moments

2009-01-02

arxiv.org/abs/0901.0288v2

Mathematics

Operator Algebras

12 pages. In the revision (to version 2) we add some citations to earlier results on extreme correlation matrices that include

Scientific paper

We investigate certain matrices composed of mixed, second-order moments of
unitaries. The unitaries are taken from C*-algebras with moments taken with
respect to traces, or, alternatively, from matrix algebras with the usual
trace. These sets are of interest in light of a theorem of E. Kirchberg about
Connes' embedding problem.

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