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arXiv 0810.3427math.APmath.FA
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具有粗糙系数的扩散方程的一些结果

Results on the diffusion equation with rough coefficients

Burak Aksoylu, Horst R. Beyer

摘要:

我们研究了稳态扩散方程的解作为一个可能粗糙($L^{\infty}$ -)扩散系数的函数的行为。这包括边界行为的解决方案的地图,关联到每个扩散的解决方案对应于一些固定的源函数,当扩散接近无穷大值的部分介质。在$n$ -维,$n \geq 1$,通过假设一个弱的概念上的扩散收敛,我们证明了强序列连续的解决方案的地图。在一维空间中,我们证明了一个更强的结果,即,唯一的可扩展性的地图的解决方案运营商,关联到每个扩散相应的解决方案运营商,一个连续的地图在运营商规范上的一组包含“diffusivities”假设无限的值在部分介质。在这种情况下,我们也给出了明确的估计的收敛性。

英文摘要:

We study the behaviour of the solutions of the stationary diffusion equation as a function of a possibly rough ($L^{\infty}$-) diffusivity. This includes the boundary behaviour of the solution maps, associating to each diffusivity the solution corresponding to some fixed source function, when the diffusivity approaches infinite values in parts of the medium. In $n$-dimensions, $n \geq 1$, by assuming a weak notion of convergence on the set of diffusivities, we prove the strong sequential continuity of the solution maps. In 1-dimension, we prove a stronger result, i.e., the unique extendability of the map of solution operators, associating to each diffusivity the corresponding solution operator, to a sequentially continuous map in the operator norm on a set containing `diffusivities' assuming infinite values in parts of the medium. In this case, we also give explicit estimates on the convergence behaviour of the map.

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