Optimal domain of Volterra operators in Korenblum spaces

Abstract

The aim of this article is to study the largest domain space $[T,X]$, whenever it exists, of a given continuous linear operator $T:X\to X$, where $X\subseteq H(\mathbb{D})$ is a Banach space of analytic functions on the open unit disc $\mathbb{D}\subseteq \mathbb{C}$. That is, $[T,X]\subseteq H(\mathbb{D})$ is the \textit{largest} Banach space of analytic functions containing $X$ to which $T$ has a continuous, linear, $X$-valued extension $T:[T,X]\to X$. The class of operators considered consists of generalized Volterra operators $T$ acting in the Korenblum growth Banach spaces $X:=A^{-\gamma }$, for $\gamma >0$. Previous studies dealt with the classical Cesàro operator $T:=C$ acting in the Hardy spaces $H^p$, $1\le p<\infty$, \cite{CR}, \cite{CR1}, in $A^{-\gamma }$, \cite{ABR-R}, and more recently, generalized Volterra operators $T$ acting in $X:=H^p$, \cite{BDNS}.

Version 2, Bull. Sci. Math. (to appear), 31 pages