Variational source condition for Ill-posed backward nonlinear Maxwell's equations
This paper analyzes the Tikhonov regularization for ill-posed backward nonlinear Maxwell's equations. We propose a variational source condition (VSC), leading to power-type convergence rates for the Tikhonov regularization. By means of the complex interpolation theory, the proposed VSC is verified under a piecewise H⁸-type Sobolev regularity assumption on the exact initial data. The second part of the paper is focused on the sensitivity analysis for the nonlinear forward Maxwell system and the first-order optimality conditions for the Tikhonov regularization. As a final result, we prove a strong convergence result for the corresponding adjoint state with power-type convergence rates based on VSC.
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