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arXiv 2203.01809math.AP
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对称张量场广义射线变换的唯一延拓结果

Unique continuation results for certain generalized ray transforms of symmetric tensor fields

Divyansh Agrawal, Venkateswaran P. Krishnan, Suman Kumar Sahoo

摘要:

令$I_{m}$表示作用在紧支撑对称$m$ -张量场分布$f$上的欧几里德射线变换,$I_{m}^{*}$是它的形式$L^2$伴随.研究了正规算子$N_{m}=I_{m}^{*}I_{m}$的唯一延拓结果.更精确地说,我们证明了,如果$N_{m}$在一个点$x_0$处消失到无穷阶,并且如果作用在$f$上的圣维南算子$W$在包含$x_0$的开集上消失,则$f$是一个势张量场。这概括了最近的两个作品Ilmavirta和Mönkkönen谁证明了这种独特的延续结果射线变换的功能和向量场/1-形式。这项工作的主要贡献之一是确定圣维南算子作用于高阶张量场作为右推广的外导数算子作用于1-形式,这使得独特的延续结果的射线变换的高阶张量场可能。在本文的后半部分,我们证明了类似的动量射线和横向射线变换的唯一延拓结果。

英文摘要:

Let $I_{m}$ denote the Euclidean ray transform acting on compactly supported symmetric $m$-tensor field distributions $f$, and $I_{m}^{*}$ be its formal $L^2$ adjoint. We study a unique continuation result for the normal operator $N_{m}=I_{m}^{*}I_{m}$. More precisely, we show that if $N_{m}$ vanishes to infinite order at a point $x_0$ and if the Saint-Venant operator $W$ acting on $f$ vanishes on an open set containing $x_0$, then $f$ is a potential tensor field. This generalizes two recent works of Ilmavirta and Mönkkönen who proved such unique continuation results for the ray transform of functions and vector fields/1-forms. One of the main contributions of this work is identifying the Saint-Venant operator acting on higher order tensor fields as the right generalization of the exterior derivative operator acting on 1-forms, which makes unique continuation results for ray transforms of higher order tensor fields possible. In the second half of the paper, we prove analogous unique continuation results for momentum ray and transverse ray transforms.

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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