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The Calderon problem in transversally anisotropic geometries

Ferreira, DDS; Kurylev, Y; Lassas, M; Salo, M; (2016) The Calderon problem in transversally anisotropic geometries. Journal of the European Mathematical Society , 18 (11) pp. 2579-2626. 10.4171/JEMS/649. Green open access

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Abstract

We consider the anisotropic Calderon problem of recovering a conductivity matrix or a Riemannian metric from electrical boundary measurements in three and higher dimensions. In the earlier work \cite{DKSaU}, it was shown that a metric in a fixed conformal class is uniquely determined by boundary measurements under two conditions: (1) the metric is conformally transversally anisotropic (CTA), and (2) the transversal manifold is simple. In this paper we will consider geometries satisfying (1) but not (2). The first main result states that the boundary measurements uniquely determine a mixed Fourier transform / attenuated geodesic ray transform (or integral against a more general semiclassical limit measure) of an unknown coefficient. In particular, one obtains uniqueness results whenever the geodesic ray transform on the transversal manifold is injective. The second result shows that the boundary measurements in an infinite cylinder uniquely determine the transversal metric. The first result is proved by using complex geometrical optics solutions involving Gaussian beam quasimodes, and the second result follows from a connection between the Calderon problem and Gel'fand's inverse problem for the wave equation and the boundary control method.

Type: Article
Title: The Calderon problem in transversally anisotropic geometries
Open access status: An open access version is available from UCL Discovery
DOI: 10.4171/JEMS/649
Publisher version: http://dx.doi.org/10.4171/JEMS/649
Language: English
Additional information: © 2017 EMS Publishing House. All rights reserved.
Keywords: Inverse boundary value problem, Calderón problem, Riemannian manifold, complex geometrical optics solution, boundary control method
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics
URI: https://discovery.ucl.ac.uk/id/eprint/1405895
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