suboptimal error estimates for homogenization of linear elasticity systems on perforated domains

Abstract

In the present work, we established almost-sharp error estimates for linear elasticity systems in periodically perforated domains. The first result was $L^{\frac{2d}{d-1-\tau }}$-error estimates $O\left({\epsilon }^{1-\frac{\tau }{2}}\right)$ with $0<\tau <1$ for a bounded smooth domain. It followed from weighted Hardy-Sobolev's inequalities and a suboptimal error estimate for the square function of the first-order approximating corrector (which was earliest investigated by C. Kenig, F. Lin, Z. Shen \cite{KLS} under additional regularity assumption on coefficients). The new approach relied on the weighted quenched Calderón-Zygmund estimate (initially appeared in A. Gloria, S. Neukamm, F. Otto's work \cite{Gloria_Neukamm_Otto_2015} for a quantitative stochastic homogenization theory). The second effort was $L^2$-error estimates $O({\epsilon }^{\frac{5}{6}}{\ln }^{\frac{2}{3}}(1/\epsilon ))$ for a Lipschitz domain, followed from a new duality scheme coupled with interpolation inequalities. Also, we developed a new weighted extension theorem for perforated domains, and a real method imposed by Z. Shen \cite{S3} played a fundamental role in the whole project.

48 pages. Some referees had read the previous version and kindly pointed out a fatal mistake therein. The authors were grateful for this, since it started a real improvement. Again, the authors welcome any comment and remark from readers