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arXiv 2407.02255math.AP
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边界处的测度与连续向量场 I:传播方程与波动可观测性

Measure and continuous vector field at a boundary I: propagation equations and wave observability

Nicolas Burq, Belhassen Dehman, Jérôme Le Rousseau

AI总结:

本文将几何控制条件推广到 \Con1 度量情形,证明波动可观测性在该条件下成立且在 Lipschitz 扰动下稳定,并给出几何必要条件,核心贡献是在粗糙背景下建立半经典测度的传播方程。

摘要:

Bardos、Lebeau 和 Rauch 提出的著名几何控制条件是波动可观测性 [1,7] 和精确可控性的充分必要条件。该条件要求相空间中的任意点在某个有限时间内被广义测地流输运至观测区域。证明精确控制与几何控制本质上等价所需的系数初始光滑性(\Cinf)后来被放宽到 \Con2 度量/系数和 \Con3 区域 [2],这接近于保持广义测地流所需的最优光滑性。在本文中,我们研究了几何控制条件的一个自然推广,该推广对 \Con1 度量有意义,并证明了在该条件下波动可观测性成立。此外,我们建立了可观测性性质在度量的更粗糙(Lipschitz)扰动下的稳定性。我们还给出了波动可观测性成立的一个几何必要条件。描述半经典测度传播的输运方程是论证的核心。它们是通常输运方程向带边界几何的自然推广。本文主要致力于在这一非常粗糙的背景下证明此类传播方程。

英文摘要:

The celebrated geometric control condition of Bardos, Lebeau, and Rauch is necessary and sufficient for wave observability [1,7] and exact controllability. It requires that any point in phase-space be transported by the generalized geodesic flow to the region of observation in some finite time. The initial smoothness (\Cinf) required on the coefficients of the metric to prove that exact control and geometric control are essentially equivalent was subsequently relaxed to \Con2-metrics/coefficients and \Con3-domains [2] which is close to the optimal smoothness required to preserve a generalized geodesic flow. In this article, we investigate a natural generalization of the geometric control condition that makes sense for \Con1-metrics and we prove that wave observability holds under this condition. Moreover, we establish that the observability property is stable under rougher (Lipschitz) perturbation of the metric. We also provide a geometric necessary condition for wave observability to hold. Transport equations that describe the propagation of semi-classical measures are at the heart of the arguments. They are natural extensions to geometries with boundaries of usual transport equations. This article is mainly dedicated to the proof of such propagation equations in this very rough context.

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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