Traces on symmetrically normed operator ideals

Details Traces on symmetrically normed operator ideals Traces on symmetrically normed operator ideals

2011-08-12

arxiv.org/abs/1108.2598v1

Mathematics

Operator Algebras

submitted to Crelle

Scientific paper

For every symmetrically normed ideal $\mathcal{E}$ of compact operators, we give a criterion for the existence of a continuous singular trace on $\mathcal{E}$. We also give a criterion for the existence of a continuous singular trace on $\mathcal{E}$ which respects Hardy-Littlewood majorization. We prove that the class of all continuous singular traces on $\mathcal{E}$ is strictly wider than the class of continuous singular traces which respect Hardy-Littlewood majorization. We establish a canonical bijection between the set of all traces on $\mathcal{E}$ and the set of all symmetric functionals on the corresponding sequence ideal. Similar results are also proved in the setting of semifinite von Neumann algebras.

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