The Calder\'{o}n problem for nonlocal operators

TL;DR

This paper investigates the inverse problem of recovering coefficients of fractional elliptic operators from boundary data, establishing new results for nonlocal Calderón problems, including isotropic and anisotropic cases.

Contribution

It reduces the nonlocal inverse problem to a local Calderón problem and provides complete solutions for isotropic and certain anisotropic nonlocal Calderón problems.

Findings

Complete solution for isotropic nonlocal Calderón problem.

Resolution of anisotropic Calderón problem modulo an isometry.

Reduction of nonlocal inverse problem to boundary data analysis.

Abstract

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 Calder\'{o}n 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 Calder\'{o}n problem can be resolved completely, assuming some regularity assumptions on the coefficients, and the anisotropic Calder\'{o}n problem modulo an isometry which is the identity at the boundary for real-analytic anisotropic conductivities in dimension greater than two and bounded and measurable anisotropic conductivities in two dimensions.