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arXiv 2210.01192math.AP
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具有退化系数的随机椭圆算子的正则性及其在随机均匀化中的应用

Regularity of random elliptic operators with degenerate coefficients and applications to stochastic homogenization

Peter Bella, Michael Kniely

AI总结:

本文研究具有对称随机退化系数的二阶椭圆方程,建立了最小正则性半径的拉伸指数矩,并将校正子增长与定量双尺度展开等随机均匀化结果推广到退化情形。

摘要:

我们考虑散度型二阶退化椭圆方程,其系数场 $a$ 为对称随机场。在扩展第一作者、Fehrman 和 Otto [Ann. Appl. Probab. 28 (2018), no. 3, 1379-1422] 的工作(他们在退化情形下建立了 $a$-调和函数的大尺度 $C^{1,α}$ 正则性)的基础上,我们给出了描述该 $C^{1,α}$ 正则性最小尺度的最小半径 $r_*$ 的拉伸指数矩。作为对随机均匀化的应用,我们部分地将 Gloria、Neukamm 和 Otto [Anal. PDE 14 (2021), no. 8, 2497-2537] 关于校正子增长、其梯度衰减以及定量双尺度展开的结果推广到退化情形。在技术层面上,我们要求系数场系综是平稳的且满足谱隙不等式,并对 $a$ 和 $a^{-1}$ 施加矩有界条件。我们还引入了椭圆半径 $r_e$,它刻画了这些矩接近其正期望值的最小尺度。

英文摘要:

We consider degenerate elliptic equations of second order in divergence form with a symmetric random coefficient field $a$. Extending the work of the first author, Fehrman, and Otto [Ann. Appl. Probab. 28 (2018), no. 3, 1379-1422], who established the large-scale $C^{1,α}$ regularity of $a$-harmonic functions in a degenerate situation, we provide stretched exponential moments for the minimal radius $r_*$ describing the minimal scale for this $C^{1,α}$ regularity. As an application to stochastic homogenization, we partially generalize results by Gloria, Neukamm, and Otto [Anal. PDE 14 (2021), no. 8, 2497-2537] on the growth of the corrector, the decay of its gradient, and a quantitative two-scale expansion to the degenerate setting. On a technical level, we demand the ensemble of coefficient fields to be stationary and subject to a spectral gap inequality, and we impose moment bounds on $a$ and $a^{-1}$. We also introduce the ellipticity radius $r_e$ which encodes the minimal scale where these moments are close to their positive expectation value.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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