Spectral averaging for trace compatible operators

Details Spectral averaging for trace compatible operators Spectral averaging for trace compatible operators

2007-04-13

arxiv.org/abs/0704.1683v2

Mathematics

Functional Analysis

10 pages, LaTeX; a gap in the proof of Proposition 2.4 has been fixed

Scientific paper

In this note the notions of trace compatible operators and infinitesimal spectral flow are introduced. We define the spectral shift function as the integral of infinitesimal spectral flow. It is proved that the spectral shift function thus defined is absolutely continuous and Krein's formula is established. Some examples of trace compatible affine spaces of operators are given.

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