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arXiv 2011.10777math.APmath.OC
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具有二次Hamilton算子的薛定谔方程的可观测性

Observability for Schrödinger equations with quadratic Hamiltonians

Alden Waters

摘要:

我们考虑不定常谐振子,并利用高斯波包构造相应的薛定谔方程的参数。这种高斯波包的参数化方法是精确的和易处理的。利用这一参数,我们证明了一类有限初始数据在无界域$ω$上的$L^2$和$L^2-L^{\infty}$可观测性估计.该数据包括一类紧支持的分段$C^1$函数,它是从特征函数扩展而来的。这种形式的初始数据的大部分质量远离$ω^c=Ω$,这是一个连通的有界域,是可观察的,但以$Ω$为中心的数据必须非常接近于一个单一的高斯是可观察的。在某些不定常谐振子的情况下,我们还给出了已建立的简谐振子原理的反例。

英文摘要:

We consider time dependent harmonic oscillators and construct a parametrix to the corresponding Schrödinger equation using Gaussian wavepackets. This parametrix of Gaussian wavepackets is precise and tractable. Using this parametrix we prove $L^2$ and $L^2-L^{\infty}$ observability estimates on unbounded domains $ω$ for a restricted class of initial data. This data includes a class of compactly supported piecewise $C^1$ functions which have been extended from characteristic functions. Initial data of this form which has the bulk of its mass away from $ω^c=Ω$, a connected bounded domain, is observable, but data centered over $Ω$ must be very nearly a single Gaussian to be observable. We also give counterexamples to established principles for the simple harmonic oscillator in the case of certain time dependent harmonic oscillators.

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