Analysis, Dynamics and Applications Seminar

We combine data-driven reduced order models (ROM) with the Lippmann- Schwinger integral equation to produce a direct nonlinear inversion method. The ROM is viewed as a Galerkin projection and is sparse due to Lanczos orthogonalization. Embedding into the continuous problem, a data-driven internal solution is produced. This internal solution is then used in the Lippmann-Schwinger equation,  in a direct or iterative framework. The new approach also allows us to process non-square  matrix-valued data-transfer functions,  i.e., to remove the main limitation  of the earlier versions of  the ROM  based inversion algorithms. We show numerical experiments for spectral domain data for which our inversion is far superior to the Born inversion.

Place: Hybrid, Math, 402 and Zoom: https://arizona.zoom.us/j/81150211038  Password: “arizona” (all lower case)