Bohr radius for Banach spaces on simply connected domains

Abstract

Let $H^{\infty }(\Omega ,X)$ be the space of bounded analytic functions $f(z)={\sum }_{n=0}^{\infty }{x}_n{z}^n$ from a proper simply connected domain $\Omega$ containing the unit disk $\mathbb{D}:=\{z\in \mathbb{C}:|z|<1\}$ into a complex Banach space $X$ with $\norm{f}_{H^{\infty}(Ω,X)} \leq 1$. Let $\varphi =\{{\varphi }_n(r){\}}_{n=0}^{\infty }$ with ${\varphi }_0(r)\le 1$ such that ${\sum }_{n=0}^{\infty }{\varphi }_n(r)$ converges locally uniformly with respect to $r\in [0,1)$. For $1\le p,q<\infty$, we denote \begin{equation*} R_{p,q,ϕ}(f,Ω,X)= \sup \left\{r \geq 0: \norm{x_{0}}^p ϕ_{0}(r) + \left(\sum_{n=1}^{\infty} \norm{x_{n}}ϕ_{n}(r)\right)^q \leq ϕ_{0}(r)\right\} \end{equation*} and define the Bohr radius associated with $\varphi$ by $$R_{p,q,ϕ}(Ω,X)=\inf \left\{R_{p,q,ϕ}(f,Ω,X): \norm{f}_{H^{\infty}(Ω,X)} \leq 1\right\}.$$ In this article, we extensively study the Bohr radius $R_{p,q,\varphi }(\Omega ,X)$, when $X$ is an arbitrary Banach space and $X$ is certain Hilbert space. Furthermore, we establish the Bohr inequality for the operator-valued Cesáro operator and Bernardi operator.

We revise the proof of Theorem 1.2. This paper contains 23 pages, 12 figures, 6 tables

References in corpus (1)

• The Bohr Phenomenon for analytic functions on simply connected domains