Functions of perturbed dissipative operators
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A. B. Aleksandrov and V. V. Peller
Translated by: the authors - St. Petersburg Math. J. 23 (2012), 209-238
- DOI: https://doi.org/10.1090/S1061-0022-2012-01194-5
- Published electronically: January 23, 2012
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Abstract:
We generalize our earlier results to the case of maximal dissipative operators. We obtain sharp conditions on a function analytic in the upper half-plane to be operator Lipschitz. We also show that a Hölder function of order $\alpha$, $0<\alpha <1$, that is analytic in the upper half-plane must be operator Hölder of order $\alpha$. More general results for arbitrary moduli of continuity will also be obtained. Then we generalize these results to higher order operator differences. We obtain sharp conditions for the existence of operator derivatives and express operator derivatives in terms of multiple operator integrals with respect to semi-spectral measures. Finally, we obtain sharp estimates in the case of perturbations of Schatten–von Neumann class $\boldsymbol {S}_p$ and obtain analogs of all the results for commutators and quasicommutators. Note that the proofs in the case of dissipative operators are considerably more complicated than the proofs of the corresponding results for self-adjoint operators, unitary operators, and contractions.References
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Bibliographic Information
- A. B. Aleksandrov
- Affiliation: St. Petersburg Branch, Steklov Mathematical Institute, Fontanka 27, St. Petersburg 191023, Russia
- MR Author ID: 195855
- Email: alex@pdmi.ras.ru
- V. V. Peller
- Affiliation: Department of Mathematics, Michigan State University, East Lansing, Michigan 48824
- MR Author ID: 194673
- Email: peller@math.msu.edu
- Received by editor(s): September 22, 2010
- Published electronically: January 23, 2012
- Additional Notes: The first author was partially supported by RFBR grant 08-01-00358-a.
The second author was partially supported by NSF grant DMS 1001844 and by ARC grant. - © Copyright 2012 American Mathematical Society
- Journal: St. Petersburg Math. J. 23 (2012), 209-238
- MSC (2010): Primary 47A56; Secondary 47B44
- DOI: https://doi.org/10.1090/S1061-0022-2012-01194-5
- MathSciNet review: 2841671
Dedicated: To the memory of M. Sh. Birman