Singular-component conjecture for A-L measures on Dirichlet-regular Widom sets

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Let E{\mathsf{E}} be a Dirichlet-regular Widom set with DCT, and let μα\mu^\alpha be the associated measure for some α∈π1(Ω)∗\alpha\in\pi_1(\Omega)^*. The A-L condition means that the complex Martin function Θ\Theta is normalized so that

lim⁡y→∞Im⁡Θ(iy)y=1.\lim_{y\to\infty}\frac{\operatorname{Im}\Theta(iy)}{y}=1.

Conjecture on singular A-L measures. There exists a Dirichlet-regular Widom set E{\mathsf{E}} with DCT such that A-L holds and μα\mu^\alpha has a nontrivial singular component with respect to Lebesgue measure for some α\alpha.

The preceding lemma shows that under A-L, Lebesgue measure is absolutely continuous with respect to μα\mu^\alpha, so the conjecture asks whether the converse can fail through a singular component of μα\mu^\alpha.

References

Primary source

Roman Bessonov, Milivoje Lukić and Peter Yuditskii, “Reflectionless canonical systems, II. Almost periodicity and character-automorphic Fourier transforms”, arXiv:2011.05266 (2020).

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