Tetrahedral Frame Fields via Constrained Third-Order Symmetric Tensors

Tetrahedral Frame Fields via Constrained Third-Order Symmetric Tensors
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通过约束三阶对称张量的四面体框架场

DOI:
10.1007/s00332-023-09898-x
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发表时间:
2023
影响因子:
3
通讯作者:
Spirn, Daniel
Spirn, Daniel
中科院分区:
数学2区
文献类型:
--
作者:
Golovaty, Dmitry;Kurzke, Matthias;Montero, Jose Alberto;Spirn, Daniel

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四面体框架场可应用于某些类别的双折射液晶和阻挫介质。本文考虑在三维区域中构造一个四面体框架场的问题,其中边界法向量包含在边界上的框架中。要做到这一点,我们确定一个同构之间的一个给定的四面体框架和一个对称的,无痕的三阶张量在一个特定的非线性约束。然后,我们定义了一个Ginzburg-Landau型功能,惩罚相关的非线性约束。使用梯度下降,检索一个全局定义的极限张量以外的奇异集。四面体框架,然后可以恢复从这个张量的行列式最大化方法,在这项工作中开发。由此产生的数值生成的帧场是光滑的一维细丝连接在一起的三通。
Tetrahedral frame fields have applications to certain classes of nematic liquid crystals and frustrated media. We consider the problem of constructing a tetrahedral frame field in three-dimensional domains in which the boundary normal vector is included in the frame on the boundary. To do this, we identify an isomorphism between a given tetrahedral frame and a symmetric, traceless third-order tensor under a particular nonlinear constraint. We then define a Ginzburg–Landau-type functional which penalizes the associated nonlinear constraint. Using gradient descent, one retrieves a globally defined limiting tensor outside of a singular set. The tetrahedral frame can then be recovered from this tensor by a determinant maximization method, developed in this work. The resulting numerically generated frame fields are smooth outside of one-dimensional filaments that join together at triple junctions.
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