A counterexample to conformal invariance for increasing radial weights

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Let D\mathbb D denote the unit disk, let v ⁣:D→(0,∞)v\colon\mathbb D\to(0,\infty) be an increasing radial weight that is not admissible, let ϕ^∈Aut⁡(D)\hat\phi\in\operatorname{Aut}(\mathbb D), and let f∈BMOA⁡vf\in\operatorname{BMOA}_v. The non-invariance conjecture. There exist such vv, ϕ^\hat\phi, and ff for which

f∘ϕ^∉BMOA⁡v.f\circ\hat\phi\notin\operatorname{BMOA}_v.

This would exhibit failure of invariance under composition with disk automorphisms for a suitable non-admissible weight; the supplied text presents the claim among open conjectures and discusses why constructing the required function remains difficult.

References

Primary source

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

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