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arXiv · 1210.3423

Traces of compact operators and the noncommutative residue

Nigel Kalton·Steven Lord·Denis Potapov·Fedor Sukochev
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Abstract

We extend the noncommutative residue of M. Wodzicki on compactly supported classical pseudo-differential operators of order $-d$ and generalise A. Connes' trace theorem, which states that the residue can be calculated using a singular trace on compact operators. Contrary to the role of the noncommutative residue for the classical pseudo-differential operators, a corollary is that the pseudo-differential operators of order $-d$ do not have a `unique' trace; pseudo-differential operators can be non-measurable in Connes' sense. Other corollaries are given clarifying the role of Dixmier traces in noncommutative geometry \`{a} la Connes, including the definitive statement of Connes' original theorem.

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Nigel Kalton, Steven Lord, Denis Potapov, Fedor Sukochev. 2012-10-12. Traces of compact operators and the noncommutative residue. https://doi.org/10.1016/j.aim.2012.11.007

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