Reconstruction of potential and damping coefficients in a semi-linear wave equation

TL;DR

This paper develops a higher-order linearization method to reconstruct damping and potential coefficients in a semi-linear wave equation from boundary measurements, advancing inverse problem techniques.

Contribution

It introduces a novel higher-order linearization approach for reconstructing coefficients in semi-linear wave equations from Dirichlet-to-Neumann data.

Findings

Established existence of asymptotic solutions for nonlinear potential reconstruction

Reconstructed damping and potential coefficients from boundary data

Provided a detailed analysis of the forward problem

Abstract

In this article, we investigate an inverse problem for a semi-linear wave equation posed on bounded domain in $\mathbb{R}^{n+1}$, with $n \geq 2$. Our primary objective is to reconstruct the damping coefficient, the linear and nonlinear potentials from the associated Dirichlet-to-Neumann map. The analysis is based on a \emph{higher-order linearization} method. As a key step, we establish the existence of suitable asymptotic solutions, crucial for reconstructing the nonlinear potential. In addition, we also provide a detailed study of the corresponding forward problem.