TY - JOUR AU - Dykema, Ken AU - Juschenko, Kate PY - 2011/12/01 Y2 - 2024/03/28 TI - Matrices of unitary moments JF - MATHEMATICA SCANDINAVICA JA - Math. Scand. VL - 109 IS - 2 SE - Articles DO - 10.7146/math.scand.a-15186 UR - https://www.mscand.dk/article/view/15186 SP - 225-239 AB - 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. ER -