Frequency-module conjecture for Jacobi matrices of Cantor-type measures

Let K(γ)K(\gamma) be the Cantor-type set determined by γ\gamma, and let HμK(γ)H_{\mu_{K(\gamma)}} have recurrence-coefficient sequence (an)n=1(a_n)_{n=1}^\infty. An almost periodic sequence has a frequency module, the module generated by its Fourier frequencies modulo 11. Frequency-module conjecture. For any γ\gamma, the sequence (an)n=1(a_n)_{n=1}^\infty for HμK(γ)H_{\mu_{K(\gamma)}} is asymptotically almost periodic, and the almost periodic limit has frequency module

{m2n}m,n{N0}\{m2^{-n}\}_{m,n\in\{N_0\}}

modulo 11. The proposed frequency module reflects the dyadic integrated-density-of-states values observed in the gaps of the Cantor construction; the assertion is based on numerical Fourier-spectrum evidence and remains open.

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Primary source

Gökalp Alpan, Alexander Goncharov and Ahmet Nihat Şimşek, “Asymptotic properties of Jacobi matrices for a family of fractal measures”, arXiv:1603.02312 (2016).

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