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arXiv 1807.05005math.APmath.OC
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基于Carleman估计的迁移方程的可观测性不等式

Observability inequalities for transport equations through Carleman estimates

Piermarco Cannarsa, Giuseppe Floridia, Masahiro Yamamoto

摘要:

考虑$\OOO\times(0,T),$中的迁移方程$\ppp_t u(x,t) + H(t)\cdot \nabla u(x,t) = 0$,其中$T>0$和$\OOO\subset \R^d $是具有光滑边界的有界区域$\ppp\OOO$ .首先,我们证明了具有分段连续权函数的有限能量解的Carleman估计。然后,在进一步的条件下,保证$H$的轨道相交$\ppp\OOO$,我们证明了一个能量估计,从而产生一个可观性不等式。我们的研究结果的动机应用反问题。

英文摘要:

We consider the transport equation $\ppp_t u(x,t) + H(t)\cdot \nabla u(x,t) = 0$ in $\OOO\times(0,T),$ where $T>0$ and $\OOO\subset \R^d $ is a bounded domain with smooth boundary $\ppp\OOO$. First, we prove a Carleman estimate for solutions of finite energy with piecewise continuous weight functions. Then, under a further condition which guarantees that the orbits of $H$ intersect $\ppp\OOO$, we prove an energy estimate which in turn yields an observability inequality. Our results are motivated by applications to inverse problems.

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