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arXiv 2109.06607math.APmath-phmath.MP
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三维Calderón问题中的玻恩近似

The Born approximation in the three-dimensional Calderón problem

Juan A. Barceló, Carlos Castro, Fabricio Macià, Cristóbal J. Meroño

AI总结:

本研究针对三维Calderón逆电导率问题,分析了玻恩近似的闭式公式,提出平均玻恩近似并推导其显式表达式,验证了该近似保留势的信息,为逆问题研究提供新的理论工具。

摘要:

三维Calderón逆电导率问题的唯一性与重构可归结为研究薛定谔算子$-\Delta+q$的逆边界问题。我们研究球域内$q$的玻恩近似,这相当于研究该逆问题的线性化。我们首先分析任意维度$d\ge3$下实径向势的这一近似,证明该近似满足一个仅涉及与$-\Delta+q$相关的Dirichlet-to-Neumann(狄利克雷-诺伊曼)映射谱的闭式公式,该公式与一类特殊的矩问题密切相关。随后我们转向三维中的一般实值且本性有界的势,引入平均玻恩近似的概念,该概念准确捕捉了逆问题的不变性性质。我们得到了平均玻恩近似在球谐函数基下由Dirichlet-to-Neumann映射矩阵元表示的显式公式。为证明平均玻恩近似不会破坏势的信息,我们还研究了Dirichlet-to-Neumann映射矩阵元的高能行为。

英文摘要:

Uniqueness and reconstruction in the three-dimensional Calderón inverse conductivity problem can be reduced to the study of the inverse boundary problem for Schrödinger operators $-Δ+q $. We study the Born approximation of $q$ in the ball, which amounts to studying the linearization of the inverse problem. We first analyze this approximation for real and radial potentials in any dimension $d\ge 3$. We show that this approximation satisfies a closed formula that only involves the spectrum of the Dirichlet-to-Neumann map associated to $-Δ+ q$, which is closely related to a particular moment problem. We then turn to general real and essentially bounded potentials in three dimensions and introduce the notion of averaged Born approximation, which captures the exact invariance properties of the inverse problem. We obtain explicit formulas for the averaged Born approximation in terms of the matrix elements of the Dirichlet to Neumann map in the basis spherical harmonics. To show that the averaged Born approximation does not destroy information on the potential, we also study the high-energy behavior of the matrix elements of the Dirichlet to Neumann map.

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