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arXiv 2008.13676math.APmath-phmath.MP
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Landau-de Gennes模型的环面解。Part II:$\mathbb{S}^1$ -等变极小元的拓扑

Torus-like solutions for the Landau-de Gennes model. Part II: Topology of $\mathbb{S}^1$-equivariant minimizers

Federico Dipasquale, Vincent Millot, Adriano Pisante

摘要:

本文研究了三维轴对称区域和一类受限的$\mathbb{S}^1$ -等变(即,轴对称)的构造。我们假设光滑和非零的$\mathbb{S}^1$ -等变(如垂面)狄利克雷边界条件和物理相关的规范约束(Lyuksyutov约束)的内部。依靠结果在\cite{DMP1}在非对称设置,我们证明了部分正则极小远离可能的有限集的内部奇点位于对称轴上。对于一个合适的域和边界数据类,我们表明,光滑极小(环面解决方案)的水平集的签署双轴一般有限联盟的环面的革命。对于非光滑极小解(分裂解),我们利用到$\mathbb{S}^4$的显式$\mathbb{S}^1$ -等变调和映射刻画了它们在任意奇点附近的渐近行为,从而符号双轴性的一般水平集包含不变拓扑球面.最后,在模型的情况下,一个droplet,我们提供了环面的解决方案的存在性,至少当边界数据是合适的单轴变形的径向锚固,并存在分裂的解决方案的边界数据是合适的线性满调和球。

英文摘要:

We study energy minimization of a continuum Landau-de Gennes energy functional for nematic liquid crystals, in three-dimensional axisymmetric domains and in a restricted class of $\mathbb{S}^1$-equivariant (i.e., axially symmetric) configurations. We assume smooth and nonvanishing $\mathbb{S}^1$-equivariant (e.g. homeotropic) Dirichlet boundary conditions and a physically relevant norm constraint (Lyuksyutov constraint) in the interior. Relying on results in \cite{DMP1} in the nonsymmetric setting, we prove partial regularity of minimizers away from a possible finite set of interior singularities lying on the symmetry axis. For a suitable class of domains and boundary data we show that for smooth minimizers (torus solutions) the level sets of the signed biaxiality are generically finite union of tori of revolution. Concerning nonsmooth minimizers (split solutions), we characterize their asymptotic behavior around any singular point in terms of explicit $\mathbb{S}^1$-equivariant harmonic maps into $\mathbb{S}^4$, whence the generic level sets of the signed biaxiality contains invariant topological spheres. Finally, in the model case of a nematic droplet, we provide existence of torus solutions, at least when the boundary data are suitable uniaxial deformations of the radial anchoring, and existence of split solutions for boundary data which are suitable linearly full harmonic spheres.

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