Yamada's conjecture on logarithmic capacity and reproducing kernels

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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):=exp⁡lim⁡w→z(GD(w,z)−log⁡∣w−z∣).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 z∈Dz\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.

References

Primary source

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

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