Inverse problem of determining the kernel of integro-differential fractional diffusion equation in bounded domain

D. K. Durdiev ; J. J. Jumaev

Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (2023), pp. 22-35.

Résumé

In this paper, an inverse problem of determining a kernel in a one-dimensional integro-differential time-fractional diffusion equation with initial-boundary and overdetermination conditions is investigated. An auxiliary problem equivalent to the problem is introduced first. By Fourier method this auxilary problem is reduced to equivalent integral equations. Then, using estimates of the Mittag-Leffler function and successive aproximation method, an estimate for the solution of the direct problem is obtained in terms of the norm of the unknown kernel which will be used in study of inverse problem. The inverse problem is reduced to the equivalent integral equation. For solving this equation the contracted mapping principle is applied. The local existence and global uniqueness results are proven.

Détail

Keywords: fractional derivative, inverse problem, integral equation, Fourier series, Mittag–Leffler function, fixed point theorem.

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