arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.05193math.AP
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具有最终数据的抛物型方程的系数识别

Coefficient identification in parabolic equations with final data

Faouzi Triki

摘要:

本文从单个最终数据出发,确定了一个抛物型方程的二阶系数。在相关椭圆算子特征值集中和初态的假设下,证明了解的唯一性,并在最后时刻足够大时得到了反演的Lipschitz稳定性估计. Lipschitz稳定常数随时间的增长呈指数增长,这使得反演是不适定的。的稳定性估计的证明是基于一个谱分解的解决方案的抛物型方程在相关的椭圆算子的本征函数,和一个特设的方法来解决一个非线性稳态输运方程,这是本身的利益。

英文摘要:

In this work we determine the second-order coefficient in a parabolic equation from the knowledge of a single final data. Under assumptions on the concentration of eigenvalues of the associated elliptic operator, and the initial state, we show the uniqueness of solution, and we derive a Lipschitz stability estimate for the inversion when the final time is large enough. The Lipschitz stability constant grows exponentially with respect to the final time, which makes the inversion ill-posed. The proof of the stability estimate is based on a spectral decomposition of the solution to the parabolic equation in terms of the eigenfunctions of the associated elliptic operator, and an ad hoc method to solve a nonlinear stationary transport equation that is itself of interest.

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