Difference of composition operators over the half-plane

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    25 Citations (Scopus)

    Abstract

    We study the differences of composition operators acting on weighted Bergman spaces over the upper half-plane. In this setting not all composition operators are bounded and none are compact. The idea of joint pullback measure is used to give a Carleson measure characterization of when the difference of two composition operators is bounded or compact. Alternate characterizations, not using Carleson measures, are also given for certain large classes of the inducing maps for the operators. The relationship between angular derivatives and compact differences of composition operators is also explored, which, in particular, reveals a new phenomenon due to the upper half-plane not being bounded. Our results produce a variety of examples of distinct composition operators whose difference is compact, including examples when the individual operators are not bounded. The paper closes with a characterization of when the difference of composition operators is Hilbert-Schmidt.

    Original languageEnglish
    Pages (from-to)3173-3205
    Number of pages33
    JournalTransactions of the American Mathematical Society
    Volume369
    Issue number5
    DOIs
    Publication statusPublished - 2017

    Bibliographical note

    Publisher Copyright:
    © 2016 American Mathematical Society.

    Keywords

    • Bounded operator
    • Carleson measure
    • Compact operator
    • Difference of composition operators
    • Half-plane
    • Hilbert-Schmidt operator
    • Joint pullback measure
    • Weighted Bergman space

    ASJC Scopus subject areas

    • General Mathematics
    • Applied Mathematics

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