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arXiv 2302.08233math.FA
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多项式增长的加权Hardy空间上的复合算子

Composition operators on weighted Hardy spaces of polynomial growth

Bingzhe Hou, Chunlan Jiang

摘要:

本文研究了多项式增长的加权Hardy空间上的复合算子,它涉及到范数、谱和(半)Fredholmness。首先,我们估计了具有圆盘自同构符号的复合算子的范数。其次,我们讨论了具有圆盘自同构符号的复合算子的谱。特别证明了符号为任意抛物圆盘自同构的复合算子的谱总是单位圆。第三,我们考虑了符号为$φ$的复合算子$C_φ$的Fredholmness,该复合算子是闭单位圆盘上的解析自映射。证明了作用在多项式增长的加权Hardy空间上的$C_φ$具有闭值域(半Fredholness)当且仅当$φ$是有限Blaschke积.进一步得到了$C_φ$是Fredholm的充要条件是$φ$是圆盘自同构.

英文摘要:

In the present paper, we study the composition operators acting on weighted Hardy spaces of polynomial growth, which are concerned with norms, spectra and (semi-)Fredholmness. Firstly, we estimate the norms of the composition operators with symbols of disk automorphisms. Secondly, we discuss the spectra of the composition operators with symbols of disk automorphisms. In particular, it is proven of that the spectrum of a composition operator with symbol of any parabolic disk automorphism is always the unit circle. Thirdly, we consider the Fredholmness of the composition operator $C_φ$ with symbol $φ$ which is an analytic self-map on the closed unit disk. We prove that $C_φ$ acting on a weighted Hardy space of polynomial growth has closed range (semi-Fredholmness) if and only if $φ$ is a finite Blaschke product. Furthermore, it is obtained that $C_φ$ is Fredholm if and only if $φ$ is a disk automorphism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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