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arXiv 0706.2664math.FAmath.CV
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Hardy空间上紧复合算子的连通分支

On the connected component of compact composition operators on the Hardy space

Eva A. Gallardo-Gutiérrez, Maria J. González, Pekka Nieminen, Eero Saksman

摘要:

证明了单位圆盘上经典Hardy空间$H^2$上的紧复合算子的连通分支中存在非紧复合算子.这回答了Shapiro和Sundberg在1990年提出的一个问题。我们还建立了MacCluer定理的一个改进版本,给出了复合算子的差的本质范数关于其符号的角导数的下界。作为一个主要的工具,我们使用Aleksandrov-Clark措施。

英文摘要:

We show that there exist non-compact composition operators in the connected component of the compact ones on the classical Hardy space $H^2$ on the unit disc. This answers a question posed by Shapiro and Sundberg in 1990. We also establish an improved version of a theorem of MacCluer, giving a lower bound for the essential norm of a difference of composition operators in terms of the angular derivatives of their symbols. As a main tool we use Aleksandrov-Clark measures.

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