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Large-scale dispersive estimates for acoustic operators: homogenization meets localization

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arxiv 2304.14046 v3 pith:K7LCPI5R submitted 2023-04-27 math.AP math-phmath.MP

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keywords mediaacousticdispersiveestimateshomogenizationlocalizationoperatorscase
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This work relates quantitatively homogenization to Anderson localization for acoustic operators in disordered media. By blending dispersive estimates for homogenized operators and quantitative homogenization of the wave equation, we derive large-scale dispersive estimates for waves in disordered media that we apply to the spreading of low-energy eigenstates. This gives a short and direct proof that the lower spectrum of the acoustic operator is purely absolutely continuous in case of periodic media, and it further provides new lower bounds on the localization length of possible eigenstates in case of quasiperiodic or random media.

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    Nonzero eigenfunctions and A-harmonic functions of uniformly elliptic C1-coefficient operators, plus a complex-valued heat-equation solution, can achieve the maximal allowed double-exponential decay in cylinders.

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