A counterexample to conformal invariance for increasing radial weights

From papers

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 fBMOAvf\in\operatorname{BMOA}_v. The non-invariance conjecture. There exist such vv, ϕ^\hat\phi, and ff for which

fϕ^BMOAv.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.

Progress summary

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Sources & referencesView supporting material

Primary source

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

Solutions 0

No solutions have been posted yet.