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arXiv 0809.1542math.AP
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由一个分量测量的双分量抛物型方程组的反问题

Inverse problem for a parabolic system with two components by measurements of one component

Assia Benabdallah, Michel Cristofol, Patricia Gaitan, Masahiro Yamamoto

摘要:

考虑一类具有一阶和零阶耦合的抛物型方程的$2\times 2$系统,在没有初值数据的情况下,仅用一个分量的额外数据建立了Carleman估计.然后,我们应用Carleman估计确定的一些或所有的系数,在一个任意的子域中的观察在一个时间间隔内只有一个组件和数据的两个组件在一个固定的正时间$θ$在整个空间域的反问题。主要结果是反问题的Lipschitz稳定性估计。对于Lipschitz稳定性,我们必须假设两个分量在$θ$处的一些非退化条件,并且对于它,我们可以近似地通过仅输入到一个分量来控制$2 \times 2$系统的两个分量。这种近似可控性也证明了我们的新Carleman估计。最后,我们建立了零阶项与一个分量耦合的抛物型方程的$3\times 3$系统的Carleman估计,证明了相应的近似能控性。

英文摘要:

We consider a $2\times 2$ system of parabolic equations with first and zeroth coupling and establish a Carleman estimate by extra data of only one component without data of initial values. Then we apply the Carleman estimate to inverse problems of determining some or all of the coefficients by observations in an arbitrary subdomain over a time interval of only one component and data of two components at a fixed positive time $θ$ over the whole spatial domain. The main results are Lipschitz stability estimates for the inverse problems. For the Lipschitz stability, we have to assume some non-degeneracy condition at $θ$ for the two components and for it, we can approximately control the two components of the $2 \times 2$ system by inputs to only one component. Such approximate controllability is proved also by our new Carleman estimate. Finally we establish a Carleman estimate for a $3\times 3$ system for parabolic equations with coupling of zeroth-order terms by one component to show the corresponding approximate controllability with a control to one component.

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