Resolvent criteria for similarity to a normal operator with spectrum on a curve

Abstract

We give some new criteria for a Hilbert space operator with spectrum on a smooth curve to be similar to a normal operator, in terms of pointwise and integral estimates of the resolvent. These results generalize criteria of Stampfli, Van Casteren and Naboko, and answer several questions posed by Stampfli. The main tools are from our recent results on dilation to the boundary of the spectrum, along with the Dynkin functional calculus for smooth functions, which is based on pseudoanalytic continuation.

22 pages

References in corpus (4)

• The similarity problem for $J$-nonnegative Sturm-Liouville operators
• Examples of cyclic polynomially bounded operators that are not similar to contractions
• Criteria for Similarity of a Dissipative Integral Operator to a Normal Operator
• On existence of shift-type invariant subspaces for polynomially bounded operator