An inverse potential problem for subdiffusion: stability and reconstruction. (English) Zbl 1458.35477
Summary: In this work, we study the inverse problem of recovering a potential coefficient in the subdiffusion model, which involves a Djrbashian-Caputo derivative of order \(\alpha\in (0,1)\) in time, from the terminal data. We prove that the inverse problem is locally Lipschitz for small terminal time, under certain conditions on the initial data. This result extends the result in [6] for the standard parabolic case to the fractional case. The analysis relies on refined properties of two-parameter Mittag-Leffler functions, e.g., complete monotonicity and asymptotics. Further, we develop an efficient and easy-to-implement algorithm for numerically recovering the coefficient based on (preconditioned) fixed point iteration and Anderson acceleration. The efficiency and accuracy of the algorithm is illustrated with several numerical examples.
MSC:
| 35R30 | Inverse problems for PDEs |
| 35K20 | Initial-boundary value problems for second-order parabolic equations |
| 35R11 | Fractional partial differential equations |
Software:
AndersonReferences:
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