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CALDERÓN’S INVERSE PROBLEM WITH A FINITE NUMBER OF MEASUREMENTS

Published online by Cambridge University Press:  08 October 2019

GIOVANNI S. ALBERTI
Affiliation:
Department of Mathematics, University of Genoa, Via Dodecaneso 35, 16146 Genova, Italy; giovanni.alberti@unige.it, matteo.santacesaria@unige.it
MATTEO SANTACESARIA
Affiliation:
Department of Mathematics, University of Genoa, Via Dodecaneso 35, 16146 Genova, Italy; giovanni.alberti@unige.it, matteo.santacesaria@unige.it

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 $\dim {\mathcal{W}}$.

Type
Research Article
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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