4.1 Article

An inverse problem of identifying the radiative coefficient in a degenerate parabolic equation

Journal

CHINESE ANNALS OF MATHEMATICS SERIES B
Volume 35, Issue 3, Pages 355-382

Publisher

SHANGHAI SCIENTIFIC TECHNOLOGY LITERATURE PUBLISHING HOUSE
DOI: 10.1007/s11401-014-0836-x

Keywords

Inverse problem; Degenerate parabolic equation; Optimal control; Existence; Uniqueness; Stability; Convergence

Categories

Funding

  1. National Natural Science Foundation of China [11061018, 11261029]
  2. Youth Foundation of Lanzhou Jiaotong University [2011028]
  3. Long Yuan Young Creative Talents Support Program [252003]
  4. Joint Funds of the Gansu Provincial Natural Science Foundation of China [1212RJZA043]

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The authors investigate an inverse problem of determining the radiative coefficient in a degenerate parabolic equation from the final overspecified data. Being different from other inverse coefficient problems in which the principle coefficients are assumed to be strictly positive definite, the mathematical model discussed in this paper belongs to the second order parabolic equations with non-negative characteristic form, namely, there exists a degeneracy on the lateral boundaries of the domain. Based on the optimal control framework, the problem is transformed into an optimization problem and the existence of the minimizer is established. After the necessary conditions which must be satisfied by the minimizer are deduced, the uniqueness and stability of the minimizer are proved. By minor modification of the cost functional and some a priori regularity conditions imposed on the forward operator, the convergence of the minimizer for the noisy input data is obtained in this paper. The results can be extended to more general degenerate parabolic equations.

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