A modified quasi-boundary value method for the backward time-fractional diffusion problem

Wei, Ting; Wang, Jun-Gang

ESAIM: Mathematical Modelling and Numerical Analysis , Multiscale problems and techniques. Special Issue, Tome 48 (2014) no. 2, pp. 603-621

In this paper, we consider a backward problem for a time-fractional diffusion equation with variable coefficients in a general bounded domain. That is to determine the initial data from a noisy final data. Based on a series expression of the solution, a conditional stability for the initial data is given. Further, we propose a modified quasi-boundary value regularization method to deal with the backward problem and obtain two kinds of convergence rates by using an a priori regularization parameter choice rule and an a posteriori regularization parameter choice rule. Numerical examples in one-dimensional and two-dimensional cases are provided to show the effectiveness of the proposed methods.

Classification : 35R11, 35R30
Keywords: backward problem, fractional diffusion equation, modified quasi-boundary value method, convergence analysis, a priori parameter choice, morozov's discrepancy principle

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