Yamada's conjecture on logarithmic capacity and reproducing kernels

From papers

Let DD be a bounded planar domain with analytic boundary and connectivity n>1n>1. For zewz e w in DD, let GD(w,z)G_D(w,z) be the Green function and define the logarithmic capacity by

cβ(z):=explimwz(GD(w,z)logwz).c_{\beta}(z):=\exp\lim_{w\rightarrow z}\bigl(G_D(w,z)-\log|w-z|\bigr).

Let B(z)B(z) be the unweighted Bergman kernel on the diagonal, and let K^(z)\hat K(z) be the conjugate Hardy H2H^2 kernel on the diagonal. Yamada's conjecture. For every zDz\in D,

cβ(z)2<πB(z)<K^(z).c_{\beta}(z)^2<\pi B(z)<\hat K(z).

The second inequality is Saitoh's conjecture and was proved by Guan, while the strict comparison with logarithmic capacity is the remaining part of this proposed chain of inequalities.

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Sources & referencesView supporting material

Primary source

Qi'an Guan and Zheng Yuan, “A weighted version of Saitoh's conjecture”, arXiv:2207.10976 (2022).

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