Characterization conjecture for weighted composition operators on Bloch spaces

Let DD be a bounded homogeneous domain in Cn\mathbb{C}^n, let ψ\psi be a holomorphic function on DD, and let φ\varphi be a holomorphic self-map of DD. Write Wψ,φf=ψ(fφ)W_{\psi,\varphi}f=\psi(f\circ\varphi) for the weighted composition operator, and let B(D)\mathcal{B}(D) denote the Bloch space of DD. The quantities σψ,φ\sigma_{\psi,\varphi} and τψ,φ\tau_{\psi,\varphi} are the associated finiteness conditions defined in the paper. Weighted composition operator conjecture. The operator Wψ,φW_{\psi,\varphi} is bounded on B(D)\mathcal{B}(D) if and only if ψB(D)\psi\in\mathcal{B}(D) and σψ,φ\sigma_{\psi,\varphi} and τψ,φ\tau_{\psi,\varphi} are finite. Furthermore, the bounded operator Wψ,φW_{\psi,\varphi} is compact on B(D)\mathcal{B}(D) if and only if

limφ(z)Dω(φ(z))Qψ(z)=limφ(z)Dψ(z)Tφ(z)=0.\lim_{\varphi(z)\to\partial D}\omega(\varphi(z))Q_\psi(z)=\lim_{\varphi(z)\to\partial D}|\psi(z)|T_\varphi(z)=0.

The theorem immediately preceding the conjecture proves sufficiency of the compactness conditions, while the analogous necessity is known for the unit ball and polydisk but not for general bounded homogeneous domains. The conjecture also asserts the corresponding necessary and sufficient boundedness characterization.

Sources & referencesView supporting material

Primary source

Robert F. Allen and Flavia Colonna, “Weighted composition operators on the Bloch space of a bounded homogeneous domain”, arXiv:2207.12320 (2022).

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