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Inverse problem for a semi-linear elliptic equation

Banff International Research Station for Mathematical Innovation and Discovery

We consider the Dirichlet-to-Neumann map, defined in a suitable sense, for the equation $-\Delta u + V(x,u)=0$ on a compact Riemannian manifold with boundary. We show that, under certain geometrical assumptions, the Dirichlet-to-Neumann map determines V for a large class of non-linearities. The proof is constructive and is based on a multiple-fold linearization of the semi-linear equation near complex geometric optics solutions for the linearized operator, and the resulting non-linear interactions. This approach allows us to reduce the inverse problem boundary value problem to the purely geometric problem to invert a family of weighted ray transforms, that we call the Jacobi weighted ray transform. This is a joint work with Ali Feizmohammadi.

Mathematics; Global analysis, analysis on manifolds; Dynamical systems and ergodic theory; Global analysis

video/mp4

Author affiliation: University College London

2019-10-14

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/71902

Unreviewed

http://creativecommons.org/licenses/by-nc-nd/4.0/