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arXiv 1709.04097math.AP
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高阶椭圆型方程组均匀化中的一致边界估计

Uniform Boundary Estimates in Homogenization of Higher Order Elliptic Systems

Weisheng Niu, Yao Xu

摘要:

研究一类具有快速振荡周期系数的高阶椭圆算子$\mathcal{L}_ε$的均匀化一致边界估计.在不对算子作对称性假设的情况下,我们得到了$C^1$域上的一致边界$C^{m-1,λ} (0\!<\!λ\!<\!1)$,$ W^{m,p}$估计,以及$C^{1,θ} (0\!<\!θ\!<\!1)$域上的一致边界$C^{m-1,1}$估计.证明,动机深刻的工作“S. N。Armstrong和C.~ K.聪明安科学。等。诺姆上级(2016),Z.沈,肛门。PDE(2017)"基于$H^{m-1}(Ω)$中的次优收敛速率。相比之下,“C。Kenig,F. Lin和Z.申,拱口粮。机械肛门(2012),Z.沈,肛门。PDE(2017)",这里获得的收敛速度不需要对算子的对称性假设,也不需要对$u_0$(均匀化问题的解)的正则性的额外假设,因此即使对于二阶椭圆系统也可能有一些独立的兴趣。

英文摘要:

This paper focuses on the uniform boundary estimates in homogenization of a family of higher order elliptic operators $\mathcal{L}_ε$, with rapidly oscillating periodic coefficients. We derive uniform boundary $C^{m-1,λ} (0\!<\!λ\!<\!1)$, $ W^{m,p}$ estimates in $C^1$ domains, as well as uniform boundary $C^{m-1,1}$ estimate in $C^{1,θ} (0\!<\!θ\!<\!1)$ domains without the symmetry assumption on the operator. The proof, motivated by the profound work "S.N. Armstrong and C.~K. Smart, Ann. Sci. Éc. Norm. Supér. (2016), Z. Shen, Anal. PDE (2017)", is based on a suboptimal convergence rate in $H^{m-1}(Ω)$. Compared to "C.E. Kenig, F. Lin and Z. Shen, Arch. Ration. Mech. Anal. (2012), Z. Shen, Anal. PDE (2017)", the convergence rate obtained here does not require the symmetry assumption on the operator, nor additional assumptions on the regularity of $u_0$ (the solution to the homogenized problem), and thus might be of some independent interests even for second order elliptic systems.

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