Comparison of local oscillation quantities for weighted BMOA spaces

From papers

Let vv be an admissible weight, let XX be either BMOAv\operatorname{BMOA}_v or VMOAv\operatorname{VMOA}_v, and assume X⊄HX\not\subset H^\infty. Let δz\delta_z denote evaluation at zz, let γ(ψ,a,r)\gamma(\psi,a,r) be the local quantity used in the paper, and let gg and ϕ\phi be the associated data. The local-oscillation comparison conjecture. One has

supaDδϕ(a)Xγ(ψ,a,2)v,g,ψ,ϕsupaDδϕ(a)Xγ(ψ,a,1)\sup_{a\in\mathbb D}\|\delta_{\phi(a)}\|_{X^*}\gamma(\psi,a,2)\lesssim_{v,g,\psi,\phi}\sup_{a\in\mathbb D}\|\delta_{\phi(a)}\|_{X^*}\gamma(\psi,a,1)

and

lim supϕ(a)1δϕ(a)Xγ(ψ,a,2)v,g,ψ,ϕlim supϕ(a)1δϕ(a)Xγ(ψ,a,1).\limsup_{|\phi(a)|\to1}\|\delta_{\phi(a)}\|_{X^*}\gamma(\psi,a,2)\lesssim_{v,g,\psi,\phi}\limsup_{|\phi(a)|\to1}\|\delta_{\phi(a)}\|_{X^*}\gamma(\psi,a,1).

Such comparisons would relate the two scales of local oscillation appearing in the compactness criteria for weighted composition operators.

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Primary source

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

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