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arXiv 2203.02425math.APmath.FA
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无界区域上的分数阶 Calderón 问题与 Poincaré 不等式

Fractional Calderón problems and Poincaré inequalities on unbounded domains

Jesse Railo, Philipp Zimmermann

AI总结:

本文将分数阶 Calderón 问题的唯一性理论推广至具非空外部的无界区域,刻画部分数据反问题的唯一性与非唯一性,并证明 Poincaré 不等式、Runge 逼近及外部确定结果。

摘要:

我们将近期关于分数阶 Calderón 问题的许多唯一性结果推广到所有具有非空外部的区域。本文工作的亮点是刻画了在一个方向上有界的区域上,对于支撑在整个欧几里得空间中并在无穷远处衰减至常数背景电导率的电导率,分数阶电导率方程的部分数据反问题的唯一性与非唯一性。我们将 Ghosh、Salo 和 Uhlmann 关于分数阶 Calderón 问题的唯一性证明推广到一般的抽象框架,以便充分利用他们论证的全部力量。这使我们观察到,对于低阶分数阶 Laplace 算子的高阶局部扰动,许多反问题也存在唯一性结果。我们给出具体的示例模型来说明这些奇特情形,并证明了在一个方向上有界的区域上任意阶分数阶 Laplace 算子的 Poincaré 不等式。我们在这些一般框架下建立了 Runge 逼近结果,也改进了有界集合情形下的正则性假设,并证明了一般的外部确定结果。带部分数据的分数阶电导率反问题唯一性的反例将在另一项配套工作中构造。

英文摘要:

We generalize many recent uniqueness results on the fractional Calderón problem to cover the cases of all domains with nonempty exterior. The highlight of our work is the characterization of uniqueness and nonuniqueness of partial data inverse problems for the fractional conductivity equation on domains that are bounded in one direction for conductivities supported in the whole Euclidean space and decaying to a constant background conductivity at infinity. We generalize the uniqueness proof for the fractional Calderón problem by Ghosh, Salo and Uhlmann to a general abstract setting in order to use the full strength of their argument. This allows us to observe that there are also uniqueness results for many inverse problems for higher order local perturbations of a lower order fractional Laplacian. We give concrete example models to illustrate these curious situations and prove Poincaré inequalities for the fractional Laplacians of any order on domains that are bounded in one direction. We establish Runge approximation results in these general settings, improve regularity assumptions also in the cases of bounded sets and prove general exterior determination results. Counterexamples to uniqueness in the inverse fractional conductivity problem with partial data are constructed in another companion work.

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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