2008/09/22 by Jesper Carlsson, Carlsson, Jesper
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #49L25 #65N21 #FOS: Mathematics #NMR spectroscopy and applications #Numerical Analysis (math.NA) #Numerical methods in inverse problems #Optimization and Control (math.OC) #Seismic Imaging and Inversion Techniques
paper · pdf · doi:10.48550/arxiv.0809.3621
openalex publication_date 2008/09/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This report concerns the inverse problem of estimating a spacially dependent coefficient of a partial differential equation from observations of the solution at the boundary. Such a problem can be formulated as an optimal control problem with the coefficient as the control variable and the solution as state variable. The heat or the wave equation is here considered as state equation. It is well known that such inverse problems are ill-posed and need to be regularized. The powerful Hamilton-Jacobi theory is used to construct a simple and general method where the first step is to analytically regularize the Hamiltonian; next its Hamiltonian system, a system of nonlinear partial differential equations, is solved with the Newton method and a sparse Jacobian.