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arXiv 1803.02597math.APmath-phmath.MP
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具有各向同性包含的Nyneson正方形的序重构:Landau-de Gennes研究

Order Reconstruction for Nematics on Squares with Isotropic Inclusions: A Landau-de Gennes Study

Yiwei Wang, Giacomo Canevari, Apala Majumdar

摘要:

本文证明了在正方形区域上存在一个具有各向同性同心正方形夹杂的WARS型Landau-de Gennes临界点,其边界条件为正方形外缘的切线边界.有两个几何参数-外部方形边长$λ$和纵横比$ρ$,纵横比是内部方形边长和外部方形边长的比值。存在的WORS的所有几何参数和所有的温度,我们证明,无论是$λ$足够小或$ρ$足够接近统一的WORS是全球稳定的。我们研究了三种不同类型的临界点在这个模型设置:临界点与最小的两个自由度与所施加的边界条件一致,临界点与三个自由度和临界点与五个自由度。在二维的情况下,我们使用$Γ$收敛技术,以确定能量最小化的竞争对手。我们将Landau-de Gennes能量的二阶变分分解为三个独立的分量,研究了不同类型的扰动对WORS解的影响,发现它对面内扰动最敏感.在三维设置中,我们数值上找到了$28$的临界点,为适度大的值$ρ$,我们找到了两个临界点,具有完整的五个自由度的非常小的值$ρ$,周围的各向同性方形夹杂物逃逸的配置文件。

英文摘要:

We prove the existence of a well order reconstruction solution (WORS) type Landau-de Gennes critical point on a square domain with an isotropic concentric square inclusion, with tangent boundary conditions on the outer square edges. There are two geometrical parameters - the outer square edge length $λ$, and the aspect ratio $ρ$, which is the ratio of the inner and outer square edge lengths. The WORS exists for all geometrical parameters and for all temperatures; we prove that the WORS is globally stable for either $λ$ small enough or for $ρ$ sufficiently close to unity. We study three different types of critical points in this model setting: critical points with the minimal two degrees of freedom consistent with the imposed boundary conditions, critical points with three degrees of freedom and critical points with five degrees of freedom. In the two-dimensional case, we use $Γ$-convergence techniques to identify the energy-minimizing competitors. We decompose the second variation of the Landau-de Gennes energy into three separate components to study the effects of different types of perturbations on the WORS solution and find that it is most susceptible to in-plane perturbations. In the three-dimensional setting, we numerically find up to $28$ critical points for moderately large values of $ρ$ and we find two critical points with the full five degrees of freedom for very small values of $ρ$, with an escaped profile around the isotropic square inclusion.

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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