The Calderón problem with partial data in two dimensions

Imanuvilov, Oleg; Uhlmann, Gunther; Yamamoto, Masahiro

doi:10.1090/S0894-0347-10-00656-9

The Calderón problem with partial data in two dimensions
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by Oleg Yu. Imanuvilov, Gunther Uhlmann and Masahiro Yamamoto

J. Amer. Math. Soc. 23 (2010), 655-691

DOI: https://doi.org/10.1090/S0894-0347-10-00656-9

Published electronically: February 16, 2010

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Abstract:

We prove for a two-dimensional bounded domain that the Cauchy data for the Schrödinger equation measured on an arbitrary open subset of the boundary uniquely determines the potential. This implies, for the conductivity equation, that if we measure the current fluxes at the boundary on an arbitrary open subset of the boundary produced by voltage potentials supported in the same subset, we can uniquely determine the conductivity. We use Carleman estimates with degenerate weight functions to construct appropriate complex geometrical optics solutions to prove the results.

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