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We construct, by a procedure involving a dimensional reduction from a Chern-Simons theory with borders, an effective theory for a 1+1 dimensional superconductor. 1That system can be either in an ordinary phase or in a topological one,…

高能物理 - 理论 · 物理学 2021-08-12 C. D. Fosco , F. A. Schaposnik

We present a few ways of using conformal maps in the reconstruction of two-dimensional conductivities in electrical impedance tomography. First, by utilizing the Riemann mapping theorem, we can transform any simply connected domain of…

数值分析 · 数学 2017-02-27 Nuutti Hyvönen , Lassi Päivärinta , Janne P. Tamminen

This paper considers optimization problems on Riemannian manifolds and analyzes iteration-complexity for gradient and subgradient methods on manifolds with non-negative curvature. By using tools from the Riemannian convex analysis and…

数值分析 · 数学 2016-09-19 G. C. Bento , O. P. Ferreira , J. G. Melo

We investigate the continuity of boundary operators, such as the Neumann-to-Dirichlet map, with respect to the coefficient matrices of the underlying elliptic equations. We show that for nonsmooth coefficients the correct notion of…

偏微分方程分析 · 数学 2017-02-14 Luca Rondi

A direct three dimensional EIT reconstruction algorithm based on complex geometrical optics solutions and a nonlinear scattering transform is presented and implemented for spherically symmetric conductivity distributions. The scattering…

偏微分方程分析 · 数学 2010-03-22 Jutta Bikowski , Kim Knudsen , Jennifer Mueller

This paper is devoted to investigating the isometric immersion problem of Riemannian manifolds in a high codimension. It has recently been demonstrated that any short immersion from an $n$-dimensional smooth compact manifold into…

微分几何 · 数学 2025-07-22 Zhiwen Zhao

We consider an inverse boundary value problem for the Maxwell's equations with a given data assumed to be known only in accessible part $\Gamma$ of the boundary. We aim to prove an uniqueness result using the Dirichlet to Neumann map with…

数学物理 · 物理学 2020-07-14 Christian Daveau , Abdessatar Khelifi , Houssem Lihiou

We consider the problem of recovering the topology and the edge conductance value, as well as characterizing a set of electrical networks that satisfy the limitedly available Thevenin impedance measurements. The measurements are obtained…

系统与控制 · 电气工程与系统科学 2024-12-05 Shivanagouda Biradar , Deepak U Patil

We continue the development, by reduction to a first order system for the conormal gradient, of $L^2$ \textit{a priori} estimates and solvability for boundary value problems of Dirichlet, regularity, Neumann type for divergence form second…

经典分析与常微分方程 · 数学 2015-05-20 Pascal Auscher , Andreas Rosén

In this work we establish log-type stability estimates for the inverse potential and conductivity problems with partial Dirichlet-to-Neumann map, where the Dirichlet data is homogeneous on the inaccessible part. This result, to some extent,…

偏微分方程分析 · 数学 2007-08-27 Horst Heck , Jenn-Nan Wang

We consider the reconstruction of the vertex weight in the discrete Gel'fand's inverse boundary spectral problem for the graph Laplacian. Given the boundary vertex weight and the edge weight of the graph, we develop reconstruction…

数学物理 · 物理学 2024-07-25 Songshuo Li , Yixian Gao , Ru Geng , Yang Yang

We study the semi-classical microlocal structure of the Dirichlet-to-Neumann map for an arbitrary compact Riemannian manifold with a non-empty smooth boundary. We build a new, improved parametrix in the glancing region compaired with that…

偏微分方程分析 · 数学 2018-02-15 Georgi Vodev

We consider the problem of reconstruction of planar domains from their moments. Specifically, we consider domains with boundary which can be represented by a union of a finite number of pieces whose graphs are solutions of a linear…

经典分析与常微分方程 · 数学 2013-06-06 Dmitry Batenkov , Vladimir Golubyatnikov , Yosef Yomdin

We consider the problem of reconstructing the intrinsic geometry of a manifold from noisy pairwise distance observations. Specifically, let $M$ denote a diameter 1 d-dimensional manifold and $\mu$ a probability measure on $M$ that is…

机器学习 · 统计学 2025-11-18 Charles Fefferman , Jonathan Marty , Kevin Ren

We construct counterexamples for the partial data inverse problem for the fractional conductivity equation in all dimensions on general bounded open sets. In particular, we show that for any bounded domain $\Omega \subset \mathbb{R}^n$ and…

偏微分方程分析 · 数学 2024-09-10 Jesse Railo , Philipp Zimmermann

A Carleman function is a special fundamental solution with a large parameter for the Laplace operator and gives a formula to calculate the value of the solution of the Cauchy problem in a domain for the Laplace equation. The probe method…

偏微分方程分析 · 数学 2020-01-14 Masaru Ikehata

A direct reconstruction algorithm based on Calder\'on'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…

数值分析 · 数学 2020-07-20 Rashmi Murthy , Yi-Hsuan Lin , Kwancheol Shin , Jennifer L. Mueller

The large scale structure of the universe is reconstructed by means of the Wiener filter and constrained realizations of Gaussian fields. The density field constructed from optically selected galaxies (Hudson \cite{Hudson}) has been sampled…

天体物理学 · 物理学 2007-05-23 Y. Hoffman

We consider the inverse conductivity problem with one measurement for the equation $div((\sigma\_1+(\sigma\_2-\sigma\_1)\chi\_D)\nabla{u})=0$ determining the unknown inclusion $D$ included in $\Omega$. We suppose that $\Omega$ is the unit…

最优化与控制 · 数学 2007-05-23 Marc Dambrine , Djalil Kateb

In this paper, we study the problem of recovering a ground truth high dimensional piecewise linear curve $C^*(t):[0, 1]\to\mathbb{R}^d$ from a high noise Gaussian point cloud with covariance $\sigma^2I$ centered around the curve. We…

统计理论 · 数学 2025-11-18 Phillip Lo , Yuehaw Khoo