Extended Ces\`aro composition operators on weak Bloch-type spaces on the unit ball of a Hilbert space

TL;DR

This paper studies the boundedness and compactness of extended Cesàro operators on weak Bloch-type spaces over the unit ball of an infinite-dimensional Hilbert space, providing characterizations based on restrictions to finite-dimensional subspaces.

Contribution

It introduces new criteria for the boundedness and compactness of weighted extended Cesàro operators on infinite-dimensional Hilbert space unit balls, using finite-dimensional restrictions.

Findings

Characterized boundedness of operators via restrictions to m-dimensional subspaces.

Established necessary and sufficient conditions for compactness.

Extended results to Banach-valued holomorphic function spaces.

Abstract

Denote by $ B_X $ the unit ball of an infinite-dimensional complex Hilbert space $ X. $ Let $\psi \in H(B_X),$ the space of all holomorphic functions on the unit ball $B_X,$ $\varphi \in S(B_X)$ the set of holomorphic self-maps of $B_X. $ Let $C_{\psi, \varphi}: \mathcal B_{\nu}(B_X)$ (and $ \mathcal B_{\nu,0}(B_X)$) $\to \mathcal B_{\mu}(B_X) $ (and $ \mathcal B_{\mu,0}(B_X)$) be weighted extended Ces\`aro operators induced by products of the extended Ces\`aro operator $ C_\varphi $ and integral operator $T_\psi.$ In this paper, we characterize the boundedness and compactness of $ C_{\psi,\varphi} $ via the estimates for the restrictions of $ \psi $ and $ \varphi $ to a $ m$-dimensional subspace of $ X $ for some $ m\ge2. $ Based on these we give necessary as well as sufficient conditions for the boundednees, the (weak) compactness of $ \widetilde{C}_{\psi, \varphi} $ between spaces of Banach-valued holomorphic functions weak-associated to $ \mathcal B_{\nu}(B_X) $ and $ \mathcal B_{\mu}(B_X). $