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CALDERÓN’S INVERSE PROBLEM WITH A FINITE NUMBER OF MEASUREMENTS

Part of: Nontrigonometric harmonic analysis Communication, information Miscellaneous topics - Partial differential equations

Published online by Cambridge University Press:  08 October 2019

GIOVANNI S. ALBERTI Open the ORCID record for GIOVANNI S. ALBERTI [Opens in a new window]  and
MATTEO SANTACESARIA Open the ORCID record for MATTEO SANTACESARIA [Opens in a new window]
GIOVANNI S. ALBERTI
Affiliation:
Department of Mathematics, University of Genoa, Via Dodecaneso 35, 16146 Genova, Italy; [email protected], [email protected]
MATTEO SANTACESARIA
Affiliation:
Department of Mathematics, University of Genoa, Via Dodecaneso 35, 16146 Genova, Italy; [email protected], [email protected]

Abstract

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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 finitely many measurements. We also discuss a few relevant examples of finite dimensional subspaces ${\mathcal{W}}$, including bandlimited and piecewise constant potentials, and explicitly compute the number of required measurements as a function of $\dim {\mathcal{W}}$.

MSC classification

Primary: 35R30: Inverse problems
Secondary: 42C40: Wavelets and other special systems 94A20: Sampling theory
Type
Research Article
Information
Forum of Mathematics, Sigma , Volume 7 , 2019 , e35
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s) 2019

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