arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.09280math.AP
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广义弹性传递本征函数的一个局部几何性质及其应用

On a local geometric property of the generalized elastic transmission eigenfunctions and application

Huaian Diao, Hongyu Liu, Baiyi Sun

摘要:

考虑非线性和完全连续的散射映射\[ \mathcal{S}\big((Ω; λ, μ, V), \mathbf{u}^i\big)=\mathbf{u}_t^\infty(\hat{\mathbf{x}}), \quad \hat{\mathbf{x}}\in\mathbb{S}^{n-1}, \],其由于入射波场$\mathbf{u}^i$经由Lamé系统将非均匀弹性散射体$(Ω; λ, μ, V)$发送到其远场图案$\mathbf{u}_t^\infty$。这里,$(λ, μ, V)$表示在$Ω$中被压缩支撑的弹性散射体的介质配置。本文研究了$\mathcal{S}$核空间的内禀几何结构,它对弹性波的逆散射和隐身理论具有重要意义,近年来受到了广泛的关注。结果表明,本文的研究包含在对一类非自伴非椭圆传输本征值问题的几何性质的分析中。本文提出了一个广义弹性透射本征值问题,并证明了在一般正则性准则下,透射本征函数在$\partialΩ$的一个角附近局部消失。正则性准则的特征在于传输本征函数的Hölder连续性或某种傅立叶扩展性质。作为一个有趣的和重要的应用,我们应用局部几何性质,通过一个单一的远场测量,推导出几个新的独特的可识别性结果的长期逆弹性问题。

英文摘要:

Consider the nonlinear and completely continuous scattering map \[ \mathcal{S}\big((Ω; λ, μ, V), \mathbf{u}^i\big)=\mathbf{u}_t^\infty(\hat{\mathbf{x}}), \quad \hat{\mathbf{x}}\in\mathbb{S}^{n-1}, \] which sends an inhomogeneous elastic scatterer $(Ω; λ, μ, V)$ to its far-field pattern $\mathbf{u}_t^\infty$ due to an incident wave field $\mathbf{u}^i$ via the Lamé system. Here, $(λ, μ, V)$ signifies the medium configuration of an elastic scatterer that is compactly supported in $Ω$. In this paper, we are concerned with the intrinsic geometric structure of the kernel space of $\mathcal{S}$, which is of fundamental importance to the theory of inverse scattering and invisibility cloaking for elastic waves and has received considerable attention recently. It turns out that the study is contained in analysing the geometric properties of a certain non-selfadjoint and non-elliptic transmission eigenvalue problem. We propose a generalized elastic transmission eigenvalue problem and prove that the transmission eigenfunctions vanish locally around a corner of $\partialΩ$ under generic regularity criteria. The regularity criteria are characerized by the Hölder continuity or a certain Fourier extension property of the transmission eigenfunctions. As an interesting and significant application, we apply the local geometric property to derive several novel unique identifiability results for a longstanding inverse elastic problem by a single far-field measurement.

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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