Comparison of local oscillation quantities for weighted BMOA spaces

Let vv be an admissible weight, let XX be either BMOA⁡v\operatorname{BMOA}_v or VMOA⁡v\operatorname{VMOA}_v, and assume X⊄H∞X\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

sup⁡a∈D∥δϕ(a)∥X∗γ(ψ,a,2)≲v,g,ψ,ϕsup⁡a∈D∥δϕ(a)∥X∗γ(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 sup⁡∣ϕ(a)∣→1∥δϕ(a)∥X∗γ(ψ,a,2)≲v,g,ψ,ϕlim sup⁡∣ϕ(a)∣→1∥δϕ(a)∥X∗γ(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.

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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