Singular Traces and Compact Operators. I

Details Singular Traces and Compact Operators. I Singular Traces and Compact Operators. I

1993-08-09

arxiv.org/abs/funct-an/9308001v1

Journ. Funct. Analysis, 137 (1996), 281-302.

Mathematics

Operator Algebras

20 pages, AMS TeX, SFB 237-Preprint Nr.180-May 93

Scientific paper

10.1006/jfan.1996.0047

We give a necessary and sufficient condition on a positive compact operator $T$ for the existence of a singular trace (i.e. a trace vanishing on the finite rank operators) which takes a finite non-zero value on $T$. This generalizes previous results by Dixmier and Varga. We also give an explicit description of these traces and associated ergodic states on $\ell^\infty(\Bbb N)$ using tools of non standard analysis in an essential way.

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