Determining a time-dependent coefficient in a time-fractional diffusion-wave equation with the Caputo derivative by an additional integral condition

This paper is devoted to recovering a time-dependent zeroth-order coefficient in a time-fractional diffusion-wave equation with the time Caputo derivative from an additional integral condition. The uniqueness and a conditional stability for such an inverse problem are proved. Then the two-point gradient method is used to solve the inverse zeroth-order coefficient problem numerically. Some properties of the forward operator are obtained, such as the Frechet differentiability, the Lipschitz continuity and the tangential cone condition to guarantee the convergence of the proposed algorithm. Four numerical examples in one-dimensional and two-dimensional spaces are provided to show the effectiveness and stability of the suggested algorithm. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This paper focuses on recovering a time-dependent zeroth-order coefficient in a time-fractional diffusion-wave equation with the time Caputo derivative through an additional integral condition. The uniqueness and conditional stability of this inverse problem are proved, and the two-point gradient method is used for numerical solution. The properties of the forward operator are obtained to ensure the convergence of the proposed algorithm, and four numerical examples demonstrate the effectiveness and stability of the suggested approach.