Removal of the auxiliary boundedness assumption in the compactness theorem

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Let vv be a weight, let ϕ ⁣:DD\phi\colon\mathbb D\to\mathbb D be an analytic symbol, and let ψ\psi be an analytic function. The boundedness-assumption conjecture. The assumption in Theorem 1 that at least one of the following holds can be dropped:

  1. CϕL(BMOAv)C_\phi\in\mathcal L(\operatorname{BMOA}_v) and either BMOAv⊄H\operatorname{BMOA}_v\not\subset H^\infty or ψVMOAv\psi\in\operatorname{VMOA}_v;
  2. ψCϕVMOAvL(VMOAv)\left.\psi C_\phi\right|_{\operatorname{VMOA}_v}\in\mathcal L(\operatorname{VMOA}_v).

Removing this assumption would give a complete characterization of compactness for weighted composition operators such as ψCϕ\psi C_\phi on weighted BMOA spaces with admissible weights.

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Sources & referencesView supporting material

Primary source

David Norrbo, “Compactness and related properties of weighted composition operators on weighted BMOA spaces”, arXiv:2502.05533 (2025).

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