$L^p$--$L^q$ estimates for Shimorin-type integral operators
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866918301555228672 |
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| author | Li, Yuerang Wang, Zipeng Zhang, Kenan |
| author_facet | Li, Yuerang Wang, Zipeng Zhang, Kenan |
| contents | Let $ν$ be a positive measure on $[0,1]$. A Shimorin-type operator $T_ν$ is an integral operator on the unit disk given by \[ T_νf(z) = \int_{\mathbb{D}} \frac{1}{1 - z\overlineλ} \left( \int_0^1 \frac{dν(r)}{1 - r z \overlineλ} \right) f(λ) \, dA(λ), \] which originates from Shimorin's work on Bergman-type kernel representations for logarithmically subharmonic weighted Bergman spaces.
In this paper, we study $L^p$--$L^q$ estimates for $T_ν$. Unlike classical Bergman-type operators, the critical line on the $(1/p,1/q)$-plane that separates the boundedness and unboundedness regions of $T_ν$ is not immediately evident. Moreover, even along this line, new phenomena arise. In the present work, by introducing a quantity $c_ν$, \begin{itemize}
\item we first determine the critical boundary in the $(1/p,1/q)$-plane for bounded $T_ν$;
\item furthermore, on this critical line, we establish necessary and sufficient conditions for $T_ν$ which have standard Bergman-type $L^p$--$L^q$ estimates, meaning that it is bounded in the interior of the region and admits weak-type and BMO-type estimates at endpoints. \end{itemize} |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16493 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $L^p$--$L^q$ estimates for Shimorin-type integral operators Li, Yuerang Wang, Zipeng Zhang, Kenan Complex Variables Functional Analysis Let $ν$ be a positive measure on $[0,1]$. A Shimorin-type operator $T_ν$ is an integral operator on the unit disk given by \[ T_νf(z) = \int_{\mathbb{D}} \frac{1}{1 - z\overlineλ} \left( \int_0^1 \frac{dν(r)}{1 - r z \overlineλ} \right) f(λ) \, dA(λ), \] which originates from Shimorin's work on Bergman-type kernel representations for logarithmically subharmonic weighted Bergman spaces. In this paper, we study $L^p$--$L^q$ estimates for $T_ν$. Unlike classical Bergman-type operators, the critical line on the $(1/p,1/q)$-plane that separates the boundedness and unboundedness regions of $T_ν$ is not immediately evident. Moreover, even along this line, new phenomena arise. In the present work, by introducing a quantity $c_ν$, \begin{itemize} \item we first determine the critical boundary in the $(1/p,1/q)$-plane for bounded $T_ν$; \item furthermore, on this critical line, we establish necessary and sufficient conditions for $T_ν$ which have standard Bergman-type $L^p$--$L^q$ estimates, meaning that it is bounded in the interior of the region and admits weak-type and BMO-type estimates at endpoints. \end{itemize} |
| title | $L^p$--$L^q$ estimates for Shimorin-type integral operators |
| topic | Complex Variables Functional Analysis |
| url | https://arxiv.org/abs/2601.16493 |