发表机构
Department of Mathematics, Faculty of Science, University of Yaoundé I(雅温得大学一院理学院数学系)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本文研究周期穿孔域中带不定体-面谱测度的椭圆特征值问题的均匀化,证明谱渐近行为取决于组合均值符号,并给出特征值簇、特征空间及移位特征值的收敛性与误差估计。
AI 中文摘要
我们研究了周期穿孔域中一个椭圆特征值问题的均匀化,其中谱参数既通过体密度 $q$ 出现在方程中,又通过面密度 $\rho$ 出现在孔洞边界上的 Steklov 条件中,由此产生的体-面谱测度 $q\\,dy+\rho\\,dS_y$ 是不定的。我们证明,谱的渐近行为本质上取决于组合均值 $m_{\rm eff}=\int_{Y^*}q\\,dy+\int_\Gamma\rho\\,dS_y$ 是正、负还是零。在三种情形下,我们都证明了带重数的特征值簇和特征空间的收敛性,并且在额外的正则性条件下,证明了移位或重标度特征值、谱投影和对齐特征空间的 $O(\varepsilon)$ 估计。
英文摘要
We study the homogenization of an elliptic eigenvalue problem in a periodically perforated domain, where the spectral parameter appears both in the equation, through a bulk density $q$, and in a Steklov condition on the boundaries of the holes, through a surface density $ρ$, and where the resulting bulk--surface spectral measure $q\,dy+ρ\,dS_y$ is indefinite. We show that the asymptotic behavior of the spectrum depends essentially on whether the combined mean $m_{\rm eff}=\int_{Y^*}q\,dy+\int_Γρ\,dS_y$ is positive, negative, or zero. In all three cases, we prove convergence of eigenvalue clusters with multiplicity and of eigenspaces and, under additional regularity, $O(\varepsilon)$ estimates for the shifted or rescaled eigenvalues, spectral projectors, and aligned eigenspaces.
Comments41 pages