On backward problem for fractional spherically symmetric diffusion equation with observation data of nonlocal type

Abstract

Abstract The main target of this paper is to study a problem of recovering a spherically symmetric domain with fractional derivative from observed data of nonlocal type. This problem can be established as a new boundary value problem where a Cauchy condition is replaced with a prescribed time average of the solution. In this work, we set some of the results above existence and regularity of the mild solutions of the proposed problem in some suitable space. Next, we also show the ill-posedness of our problem in the sense of Hadamard. The regularized solution is given by the fractional Tikhonov method and convergence rate between the regularized solution and the exact solution under a priori parameter choice rule and under a posteriori parameter choice rule.

Keywords

• Backward in time
• Fractional spherically symmetric diffusion equation
• Fractional Tikhonov method
• Ill-posed problem
• Convergence estimates
• Regularization