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Exact local distribution of the absolutely continuous spectral measure

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arxiv 2407.09278 v1 pith:A4W6CCB3 submitted 2024-07-12 math-ph math.DSmath.MPmath.SP

classification math-phmath.DSmath.MPmath.SP
keywords measurespectralabsolutelycontinuitycontinuousdistributionlocalolder
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abstract

It is well-established that the spectral measure for one-frequency Schr\"odinger operators with Diophantine frequencies exhibits optimal $1/2$-H\"older continuity within the absolutely continuous spectrum. This study extends these findings by precisely characterizing the local distribution of the spectral measure for dense small potentials, including a notable result for any subcritical almost Mathieu operators. Additionally, we investigate the stratified H\"older continuity of the spectral measure at subcritical energies.

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  1. Lower bounds on concentration through Borel transforms and quantitative singularity of spectral measures near the arithmetic transition

    math.SP 2025-01 accept novelty 8.0 of 10

    Packing and multifractal dimensions of almost Mathieu spectral measures have upper bounds that vanish at the arithmetic transition where ln lambda equals beta.

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