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arXiv 2101.04841math.AP
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周期椭圆均匀化中的倍化不等式和节点集

Doubling inequalities and nodal sets in periodic elliptic homogenization

Carlos E. Kenig, Jiuyi Zhu, Jinping Zhuge

摘要:

证明了一类具有快速振荡周期系数的线性椭圆型方程的显式加倍不等式,并得到了弱解节点集的一致上界(在$(d-1)$维Hausdorff测度下).利用收敛速度、一个“解析性”的三球不等式和一个频率函数的单调性公式,在不同的尺度上证明了显式依赖于倍化指数的倍化不等式.利用加倍不等式、调和函数逼近和迭代引数给出了节点集的上界。

英文摘要:

We prove explicit doubling inequalities and obtain uniform upper bounds (under $(d-1)$-dimensional Hausdorff measure) of nodal sets of weak solutions for a family of linear elliptic equations with rapidly oscillating periodic coefficients. The doubling inequalities, explicitly depending on the doubling index, are proved at different scales by a combination of convergence rates, a three-ball inequality from certain "analyticity", and a monotonicity formula of a frequency function. The upper bounds of nodal sets are shown by using the doubling inequalities, approximations by harmonic functions and an iteration argument.

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