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arXiv 2302.00749math.AP
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旋转群上的径向拉普拉斯算子

Radial Laplacian on rotation groups

Pierre Degond

摘要:

在旋转群上的拉普拉斯算子是共轭不变的。因此,它将类函数映射到类函数。极大环面由块为平面旋转的分块对角矩阵组成。类函数由它们在这个极大环面上的值决定。因此,拉普拉斯算子在极大环面上导出一个二阶算子,称为径向拉普拉斯算子。本文导出了径向拉普拉斯算子的表达式。然后利用特征是类函数的Weyl特征公式来求Laplacian的特征值。虽然李群专家对这些材料很熟悉,但我们在这里以一种综合和可访问的方式收集它,这可能对需要使用这些概念的非专家有用。

英文摘要:

The Laplacian on the rotation group is invariant by conjugation. Hence, it maps class functions to class functions. A maximal torus consists of block diagonal matrices whose blocks are planar rotations. Class functions are determined by their values of this maximal torus. Hence, the Laplacian induces a second order operator on the maximal torus called the radial Laplacian. In this paper, we derive the expression of the radial Laplacian. Then, we use it to find the eigenvalues of the Laplacian, using that characters are class functions whose expressions are given by the Weyl character formula. Although this material is familiar to Lie-group experts, we gather it here in a synthetic and accessible way which may be useful to non experts who need to work with these concepts.

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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