Kari Astala, Matti Lassas, Lassi Paivarinta
We study inverse conductivity problem for an anisotropic conductivity in $L^\infty$ in bounded and unbounded domains. Also, we give applications of the results in the case when Dirichlet-to-Neumann and Neumann-to-Dirichlet maps are given only on a part of the boundary.
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Remarks on the anisotropic Calderón problem
本文研究各向异性Calderón问题，证明了横截各向异性流形上该问题的唯一性，给出一般黎曼流形上Dirichlet-to-Neumann映射值域在零势附近的凸性，并得到半线性椭圆方程对应的Calderón型反问题的相关结果。
Anisotropic Calderón Problem for a Non-Local Second Order Elliptic Operator
本文研究了闭Riemann流形上二阶非局部椭圆算子的各向异性Calderón问题，证明了利用Cauchy数据集可在标准规范下恢复流形几何结构。
Anisotropic Calderón problem of a nearly Laplace-Beltrami operator of order $2+$
本文研究闭黎曼流形上对数拉普拉斯算子的各向异性 Calderón 问题，证明柯西数据集可在标准规范等价意义下唯一恢复流形几何。
We consider Schrödinger operators at a fixed high frequency on simply connected compact Riemannian manifolds with non-positive sectional curvatures and smooth strictly convex boundaries. We prove that the Dirichlet-to-Neumann map uniquely determines the potential.
We recover the gradient of a scalar conductivity defined on a smooth bounded open set in $\mathbb{R}^d$ from the Dirichlet to Neumann map arising from the $p$-Laplace equation. For any boundary point we recover the gradient using Dirichlet data supported on an arbitrarily small neighbourhood of the boundary point. We use a Rellich-type identity in the proof. Our results are new when $p \neq 2$. In the $p = 2$ case boundary determination plays a role in several methods for recovering the conductivity in the interior.
Fractional anisotropic Calderón problem on closed Riemannian manifolds
本文解决了闭黎曼流形上的分数阶各向异性 Calderón 问题，证明由局部源到解映射可确定流形（等距意义下），为非局部类比提供了解答。
In this paper we show uniqueness of the conductivity for the quasilinear Calderón's inverse problem. The nonlinear conductivity depends, in a nonlinear fashion, of the potential itself and its gradient. Under some structural assumptions on the direct problem, a real-valued conductivity allowing a small analytic continuation to the complex plane induces a unique Dirichlet-to-Neumann (DN) map. The method of proof considers some complex-valued, linear test functions based on a point of the boundary of the domain, and a linearization of the DN map placed at these particular set of solutions.
It is proved that, in two dimensions, the Calderón inverse conductivity problem in Lipschitz domains is stable in the $L^p$ sense when the conductivities are uniformly bounded in any fractional Sobolev space $W^{α,p}$ $α>0, 1<p<\infty$.
We investigate a generalization of Calderón's problem of recovering the conductivity coefficient in a conductivity equation from boundary measurements. As a model equation we consider the p-conductivity equation with p strictly between one and infinity, which reduces to the standard conductivity equation when p equals two, and to the p-Laplace equation when the conductivity is constant. The thesis consists of results on the direct problem, boundary determination and detecting inclusions. We formulate the equation as a variational problem also when the conductivity may be zero or infinity in la…
Direct reconstruction of anisotropic self-adjoint inclusions in the Calderón problem
本文提出了一种在Calderón问题中直接重建各向异性自 adjoint包含物的方法，通过局部Neumann到Dirichlet映射和扰动条件，解决了非唯一性问题。
On the Uniqueness of a Nonlinear Discrete Calderón Problem
本文研究方格上半线性椭圆方程的离散Calderón问题，通过角激发逐层重建、线性化DtN映射及有限非线性测量，建立了电导率恢复的三个唯一性结果。
We discuss the inverse problem of determining the, possibly anisotropic, conductivity of a body $Ω\subset\mathbb{R}^{n}$ when the so--called Dirichlet-to-Neumann map is locally given on a non empty portion $Γ$ of the boundary $\partialΩ$. We extend results of uniqueness and stability at the boundary, obtained by the same authors in SIAM J. Math. Anal. 33 (2001), no. 1, 153--171, where the Dirichlet-to-Neumann map was given on all of $\partialΩ$ instead. We also obtain a pointwise stability result at the boundary among the class of conductivities which are continuous at some point $y\inΓ$. Our …
Revisiting the Anisotropic Fractional Calderón Problem Using the Caffarelli-Silvestre Extension
本文利用Caffarelli-Silvestre延拓方法重访各向异性分数阶Calderón问题，证明热核与波核可互相恢复，并建立Poisson核与波核的直接联系，从而简化恢复过程并联系局部与非局部问题。
Boundary Reconstruction for the Anisotropic Fractional Calderón Problem
针对各向异性分数 Calderón 问题，论文利用退化椭圆扩张进行局部化，并基于 Brown 方法证明可由源到解数据重构测量集上的度量。
The Calderón inverse problem for isotropic quasilinear conductivities
该研究证明了高维有界区域上一般拟线性各向同性电导率方程的Calderón逆问题全局唯一性，通过高阶线性化和复几何光学解实现。
Calderón problem for the quasilinear conductivity equation in dimension $2$
本文针对二维有界域上拟线性电导率方程的Calderón问题，通过构造两类相位的Bukhgeim型复几何解，结合稳相分析与$L^p$估计，利用高阶线性化方法证明了该问题的唯一性。
Prescribed nonlinearity helps in an anisotropic Calderón-type problem
研究拟线性各向异性椭圆方程的逆边值问题，证明三维及以上维度中其Dirichlet-to-Neumann映射可唯一确定系数矩阵，揭示预设非线性可突破经典线性Calderón问题的唯一性障碍。
On the transfer of stability from the local to the fractional anisotropic Calderón problem with exterior measurements
研究经典到分数Calderón问题的唯一性定量转移，基于外部数据推导出无Liouville变换下的主部稳定性估计，利用定量唯一延续和Runge逼近估计解决无界几何和维度不匹配的挑战。
Stability for the Calderón's problem for a class of anisotropic conductivities via an ad-hoc misfit functional
本文针对形式为σ=γA的各向异性电导率，通过构造特设失配泛函，建立了Calderón问题在该类电导率下的稳定性估计。
Local rigidity of conformally Euclidean metrics for the anisotropic Calderón problem
本文证明在光滑紧致域上，若一个黎曼度量与欧几里得度量具有相同的边界度量和Dirichlet-to-Neumann映射且足够接近，则它们通过固定边界的微分同胚等距，即欧几里得度量具有局部刚性。
We show in two dimensions that measuring Dirichlet data for the conductivity equation on an open subset of the boundary and, roughly speaking, Neumann data in slightly larger set than the complement uniquely determines the conductivity on a simply connected domain. The proof is reduced to show a similar result for the Schrödinger equation. Using Carleman estimates with degenerate weights we construct appropriate complex geometrical optics solutions to prove the results.
Transfer of Stability from the Classical to the Fractional Anisotropic Calderón Problem
该研究针对两类带源-解测量的谱分数阶各向异性Calderón问题，通过定量唯一延拓方法建立其与经典Calderón问题的稳定性、唯一性传递关系，首次得到无Liouville约化的分数阶Calderón型问题主部稳定性结果，并证明经典问题两类测量的定量关联。
We study the inverse problem of determining the coefficients of the fractional power of a general second order elliptic operator given in the exterior of an open subset of the Euclidean space. We show the problem can be reduced into determining the coefficients from the boundary Cauchy data of the elliptic operator on the open set, the Calderón problem. As a corollary we establish several new results for nonlocal inverse problems by using the corresponding results for the local inverse problems. In particular the isotropic nonlocal Calderón problem can be resolved completely, assuming some reg…
The anisotropic Calderón problem: rigidity near the Euclidean metric
该文证明三维及以上区域中各向异性Calderón问题在欧几里得度量附近的刚性：若光滑度量充分接近欧几里得度量且具有相同Dirichlet-to-Neumann映射，则必相差一个固定边界的微分同胚，方法结合调和坐标与Carleman估计。
In this paper we study the inverse conductivity problem with partial data. Moreover, we show that, in dimension $n\geq 3$ the uniqueness of the Calderón problem holds for the $C^{1}\bigcap H^{3/2, 2}$ conductivities.
Fractional anisotropic Calderón problem on complete Riemannian manifolds
本文证明了完备黎曼流形的度量张量可由局部源到解算子唯一确定（等距意义下），该算子与分数阶Laplace-Beltrami算子相关，并推广至闭流形情形。
The Calderón Problem for Quasilinear Conductivities of Conformally Transversally Anisotropic Media
本文研究维数n≥3的共形横向各向异性流形上含电势和电场依赖的拟线性电导率Calderón问题，证明其在(s,p)=(t,0)处的导数由边界测量唯一确定，且解析电导率可唯一恢复。
Fractional anisotropic Calderón problem with external data
本文在欧几里得空间中解决了二维及以上的分数阶各向异性Calderón问题，证明了部分外部Dirichlet--to--Neumann映射可确定黎曼度量至微分同胚，并给出了两种证明方法。
The inverse problem for the fractional conductivity equation: a survey
本文综述了分数阶Calderón问题，重点收集了与其电导率方程表述相关的最新研究成果。
In this paper, we use the theory of symmetric Dirichlet forms to give a probabilistic interpretation of Calderón's inverse conductivity problem in terms of reflecting diffusion processes and their corresponding boundary trace processes.
The local Calderón problem and the determination at the boundary of a complex anisotropic admittivity
研究通过局部Dirichlet到Neumann映射确定各向异性复电导率，建立Lipschitz和Hölder稳定性估计。
The anisotropic Calderón problem at large fixed frequency on manifolds with invertible ray transform
本文研究大固定频率下由 Dirichlet 到 Neumann 映射恢复势的逆问题，将已有结果推广至简单流形及射线变换稳定可逆的流形，采用不变的高斯波束拟模构造并保证常数一致有界。
The Calderón problem for piecewise polynomial anisotropic conductivities on partitions with many flat faces
针对n≥3维分段多项式各向异性电导率，通过平面界面逐步恢复和Runge逼近，证明局部Dirichlet-to-Neumann映射唯一确定所有多项式块，并具有Hölder稳定性。
We prove uniqueness in the inverse conductivity problem for uniformly elliptic conductivities in $W^{s,p}(Ω)$, where $Ω\subset \mathbb R^n$ is Lipschitz, $3\leq n \leq 6$, and $s$ and $p$ are such that $ W^{s,p}(Ω)\not \subset W^{1,\infty}(Ω)$. In particular, we obtain uniqueness for conductivities in $W^{1,n}(Ω)$ ($n=3,4$). This improves on the result of the author and Tataru, who assumed that the conductivity is Lipschitz.
We consider the Calderòn problem in an infinite cylindrical domain, whose cross section is a bounded domain of the plane. We prove log-log stability in the determination of the isotropic periodic conductivity coefficient from partial Dirichlet data and partial Neumann boundary observations of the solution.
We consider the so called Calderón problem which corresponds to the determination of a conductivity appearing in an elliptic equation from boundary measurements. Using several known results we propose a simplified and self contained proof of this result.
A direct reconstruction algorithm based on Calderón's linearization method for the reconstruction of isotropic conductivities is proposed for anisotropic conductivities in two-dimensions. To overcome the non-uniqueness of the anisotropic inverse conductivity problem, the entries of the unperturbed anisotropic tensors are assumed known \emph{a priori}, and it remains to reconstruct the multiplicative scalar field. The quasi-conformal map in the plane facilitates the Calderón-based approach for anisotropic conductivities. The method is demonstrated on discontinuous radially symmetric conductivit…
Partial data Calderón problem for quasilinear conductivities in dimension 2
研究二维拟线性电导率的部分数据卡尔德隆问题，核心方法是基于高阶线性化及利用二维中部分边界消失的CGO解，通过改进余项估计、分析相位组合模式，最终证明唯一性结果。
We use X^{s,b}-inspired spaces to prove a uniqueness result for Calderon's problem in a Lipschitz domain under the assumption that the conductivity is Lipschitz. For Lipschitz conductivities, we obtain uniqueness for conductivities close to the identity in a suitable sense. We also prove uniqueness for arbitrary C^1 conductivities.
Quasianalyticity and geometric rigidity in anisotropic Calderón's problem
本文针对n≥3维未解决的各向异性Calderón问题，在两种互补情形下建立唯一性结果，揭示了正则性、几何结构与边界访问间的权衡关系。
The fractional anisotropic Calderón problem for a nonlocal parabolic equation on closed Riemannian manifolds
本文研究闭黎曼流形上非局部抛物型方程的分数阶各向异性Calderón问题，证明通过任意小开圆柱体内的局部源到解映射可在等距意义下确定流形，并借助半群理论分析了非局部抛物型算子的谱性质。
The Calderón problem for near-Euclidean metrics
研究紧致带边黎曼流形上稳态薛定谔方程边界测量确定势的反问题，证明欧几里得度量小扰动下的全局唯一性。
In this paper we prove log log type stability estimates for inverse boundary value problems on admissible Riemannian manifolds of dimension $n \geq 3$. The stability estimates correspond to a couple of uniqueness results by Dos Santos Ferrera, Kenig, Salo and Uhlmann. These inverse problems arise naturally when studying the anisotropic Calderón problem.
In this article we study the linearized anisotropic Calderon problem. In a compact manifold with boundary, this problem amounts to showing that products of harmonic functions form a complete set. Assuming that the manifold is transversally anisotropic, we show that the boundary measurements determine an FBI type transform at certain points in the transversal manifold. This leads to recovery of transversal singularities in the linearized problem. The method requires a geometric condition on the transversal manifold related to pairs of intersecting geodesics, but it does not involve the geodesic…
This work considers properties of the Neumann-to-Dirichlet map for the conductivity equation under the assumption that the conductivity is identically one close to the boundary of the examined smooth, bounded and simply connected domain. It is demonstrated that the so-called bisweep data, i.e., the (relative) potential differences between two boundary points when delta currents of opposite signs are applied at the very same points, uniquely determine the whole Neumann-to-Dirichlet map. In two dimensions, the bisweep data extend as a holomorphic function of two variables to some (interior) neig…
On the anisotropic Calderón's problem
该研究证明了维数 n≥3 的紧流形上，Laplace–Beltrami 算子的 Dirichlet-to-Neumann 映射可在边界固定等距意义下唯一确定 Riemann 度量。
The unique determination of a measurable conductivity from the Dirichlet-to-Neumann map of the equation $\mathrm{div} (σ\nabla u) = 0$ is the subject of this note. A new strategy, based on Clifford algebras and a higher dimensional analogue of the Beltrami equation, is here proposed. This represents a possible first step for a proof of uniqueness for the Calderón problem in three and higher dimensions in the $L^\infty$ case.
The conformal Poisson embedding method for the anisotropic Calderón problem with a potential
该研究针对带位势的各向异性Calderón问题，证明了Δ_g+q的局部Dirichlet-to-Neumann映射可确定对应黎曼流形与位势，发展共形泊松嵌入方法并获新结果。
We consider the anisotropic Calderon problem of recovering a conductivity matrix or a Riemannian metric from electrical boundary measurements in three and higher dimensions. In the earlier work \cite{DKSaU}, it was shown that a metric in a fixed conformal class is uniquely determined by boundary measurements under two conditions: (1) the metric is conformally transversally anisotropic (CTA), and (2) the transversal manifold is simple. In this paper we will consider geometries satisfying (1) but not (2). The first main result states that the boundary measurements uniquely determine a mixed Four…
Reconstruction of cracks in Calderón's inverse conductivity problem using energy comparisons
针对Calderón反电导率问题中的Lipschitz超曲面型裂纹，提出两种重构方法：一种可通过算子不等式收缩上界得到精确位置，能同时处理两类裂纹；另一种针对单一类型裂纹生成保证为未知裂纹子集的近似结果，填补了相关严格重构方法的空白。
Reconstruction for the Calderón problem with Lipschitz conductivities
本文研究 Lipschitz 电导率下的 Calderón 反问题，通过局部求解积分方程并构造含双参数的等价 Sobolev 范数实现压缩，从而由边界电学测量重构内部电导率。
Anisotropic Calderón problem for a logarithmic Schrödinger operator of order $2+$ on closed Riemannian manifolds
本文研究了闭黎曼流形上非局部对数薛定谔算子的各向异性Calderón问题，证明了在底层流形相同或集合互异情形下，可通过Cauchy数据唯一恢复黎曼度量与势函数。
The local complex Calderón problem. Stability in a layered medium for a special type of anisotropic admittivity
本文研究分层各向异性介质中的局部复Calderón问题，在导纳为已知矩阵与未知分层仿射复值函数乘积的假设下，基于失配泛函和局部Dirichlet-to-Neumann映射给出了相应的Hölder和Lipschitz稳定性估计。
Electrical Impedance Imaging would suffer a serious obstruction if for two different conductivities the potential and current measured at the boundary were the same. The Calderón's problem is to decide whether the conductivity is indeed uniquely determined by the data at the boundary. In $\mathbb{R}^d$, for $d=5,6$, we show that uniqueness holds when the conductivity is in $W^{1+\frac{d-5}{2p}+, p}(Ω)$, for $d\le p <\infty$. This improves on recent results of Haberman, and of Ham, Kwon and Lee. The main novelty of the proof is an extension of Tao's bilinear Theorem.
A Reduction of the Fractional Calderón Problem to the Local Calderón Problem by Means of the Caffarelli-Silvestre Extension
通过Caffarelli-Silvestre延拓，将分数阶Calderón问题的部分Dirichlet-to-Neumann数据转化为局部问题的完整数据，从而将非局部唯一性归结为局部唯一性，并给出构造性恢复方案及逆转障碍。
We construct anisotropic conductivities with the same Dirichlet-to-Neumann map as a homogeneous isotropic conductivity. These conductivities are singular close to a surface inside the body.
We investigate inverse problems in the determination of leading coefficients for nonlocal parabolic operators, by knowing the corresponding Cauchy data in the exterior space-time domain. The key contribution is that we reduce nonlocal parabolic inverse problems to the corresponding local inverse problems with the lateral boundary Cauchy data. In addition, we derive a new equation and offer a novel proof of the unique continuation property for this new equation. We also build both uniqueness and non-uniqueness results for both nonlocal isotropic and anisotropic parabolic Calderón problems, resp…
We study the enclosure method for the p-Calderón problem, which is a nonlinear generalization of the inverse conductivity problem due to Calderón that involves the p-Laplace equation. The method allows one to reconstruct the convex hull of an inclusion in the nonlinear model by using exponentially growing solutions introduced by Wolff. We justify this method for the penetrable obstacle case, where the inclusion is modelled as a jump in the conductivity. The result is based on a monotonicity inequality and the properties of the Wolff solutions.
In this article we study the linearized anisotropic Calderón problem on a compact Riemannian manifold with boundary. This problem amounts to showing that products of pairs of harmonic functions of the manifold form a complete set. We assume that the manifold is transversally anisotropic and that the transversal manifold is real analytic and satisfies a geometric condition related to the geometry of pairs of intersecting geodesics. In this case, we solve the linearized anisotropic Calderón problem. The geometric condition does not involve the injectivity of the geodesic X-ray transform. Crucial…
We prove that an $L^\infty$ potential in the Schrödinger equation in three and higher dimensions can be uniquely determined from a finite number of boundary measurements, provided it belongs to a known finite dimensional subspace $\mathcal W$. As a corollary, we obtain a similar result for Calderón's inverse conductivity problem. Lipschitz stability estimates and a globally convergent nonlinear reconstruction algorithm for both inverse problems are also presented. These are the first results on global uniqueness, stability and reconstruction for nonlinear inverse boundary value problems with f…
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