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arXiv 2004.12025math-phmath.MPmath.PRmath.SP
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平稳随机 Schrödinger 算子的一种新谱分析

A new spectral analysis of stationary random Schrödinger operators

Mitia Duerinckx, Christopher Shirley

AI总结:

本文以平稳随机 Floquet 型纤维化重构随机 Schrödinger 算子的谱分析,提出共振猜想,并借助 Malliavin 分析与 Mourre 理论首次从谱角度证明动力学时间尺度上的时间关联衰减。

摘要:

受弱无序介质中量子波的长时间输运性质启发,本工作将随机 Schrödinger 算子置于一种新的谱视角下。基于 Floquet 型纤维化的平稳随机版本,我们把量子动力学的描述归结为底层概率空间上一族纤维化的抽象谱扰动问题。我们对这些纤维化算子陈述了一个自然的共振猜想:与周期和拟周期情形相反,这将意味着 Bloch 波并非作为扩展态存在,而是作为共振模式存在,并且这将证明时间关联的预期指数衰减是合理的。尽管该共振猜想仍未解决,我们发展了用于概率空间上谱分析的新工具,尤其展示了 Malliavin 分析的思想如何导出严格的 Mourre 型结果:我们得到了一个近似动力学共振结果,以及在动力学时间尺度上时间关联衰减的首个谱证明。这种谱方法提出了一条规避微扰展开和重整化技术的全新途径。

英文摘要:

Motivated by the long-time transport properties of quantum waves in weakly disordered media, the present work puts random Schrödinger operators into a new spectral perspective. Based on a stationary random version of a Floquet type fibration, we reduce the description of the quantum dynamics to a fibered family of abstract spectral perturbation problems on the underlying probability space. We state a natural resonance conjecture for these fibered operators: in contrast with periodic and quasiperiodic settings, this would entail that Bloch waves do not exist as extended states, but rather as resonant modes, and this would justify the expected exponential decay of time correlations. Although this resonance conjecture remains open, we develop new tools for spectral analysis on the probability space, and in particular we show how ideas from Malliavin calculus lead to rigorous Mourre type results: we obtain an approximate dynamical resonance result and the first spectral proof of the decay of time correlations on the kinetic timescale. This spectral approach suggests a whole new way of circumventing perturbative expansions and renormalization techniques.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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