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arXiv 1809.06111math.AP
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关于散度型随机平稳椭圆算子的均匀化

On the homogenization of random stationary elliptic operators in divergence form

Arianna Giunti, Juan J. L. Velázquez

摘要:

在本说明中,我们评论均匀化的随机椭圆算子的散度型$-\nabla \cdot a\nabla$,其中的系数字段$a$分布根据一个平稳的,但不一定遍历,概率测度$P$。我们推广了著名的$P$平稳和遍历的情况下,运营商$-\nabla \cdot a(\frac{\cdot}{\varepsilon})\nabla$几乎必然均匀的常数系数,随机运营商$-\nabla \cdot A_h\nabla$。此外,我们使用一个分解公式$P$关于一个家庭的遍历和平稳的概率测度表明,法律的$A_h$可以得到通过使用标准的均匀化结果对每个概率测度的前一个家庭。最后,我们提供了一个更明确的公式$A_h$的情况下,系数场是一个函数的平稳高斯场。

英文摘要:

In this note we comment on the homogenization of a random elliptic operator in divergence form $-\nabla \cdot a\nabla$, where the coefficient field $a$ is distributed according to a stationary, but not necessarily ergodic, probability measure $P$. We generalize the well-known case for $P$ stationary and ergodic by showing that the operator $-\nabla \cdot a(\frac{\cdot}{\varepsilon})\nabla$ almost surely homogenizes to a constant-coefficient, random operator $-\nabla \cdot A_h\nabla$. Furthermore, we use a disintegration formula for $P$ with respect to a family of ergodic and stationary probability measures to show that the law of $A_h$ may be obtained by using the standard homogenization results on each probability measure of the previous family. We finally provide a more explicit formula for $A_h$ in the case of coefficient fields which are a function of a stationary Gaussian field.

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