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arXiv 1701.08445math-phmath.FAmath.MP
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离散Clifford分析中的旋群及其作用

The Spingroup and its actions in discrete Clifford analysis

Hilde De Ridder, Franciscus Sommen

摘要:

最近,人们已经确定离散星拉普拉斯和离散狄拉克算子,即在标准网格上工作时其连续对应物的离散版本,是旋转不变的。从特殊正交李群SO(m)对应的李代数SO(m,C)出发,考虑其在离散Clifford代数中的表示,证明了这些算子是Dirac算子和Laplace算子的对称性。这种设置以抽象的方式表明,表示理论上的离散设置反映了欧几里得克利福德分析设置。然而,从实际的观点来看,群作用对于实际计算仍然是不可缺少的。本文定义了SO(m)的双覆盖--离散Spinggroup,并考虑了它对离散函数的作用.我们证明了这种群作用使空间Hk和Mk成为Spin(m)-表示。我们经常会考虑我们的结果与so(m,C)- action下的结果的一致性。

英文摘要:

Recently, it has been established that the discrete star Laplace and the discrete Dirac operator, i.e. the discrete versions of their continuous counterparts when working on the standard grid, are rotation-invariant. This was done starting from the Lie algebra so(m, C) corresponding to the special orthogonal Lie group SO(m), considering its representation in the discrete Clifford algebra setting and proving that these operators are symmetries of the Dirac and Laplace operators. This set-up showed in an abstract way that representation-theoretically the discrete setting mirrors the Euclidean Clifford analysis setting. However from a practical point of view, the group-action remains indispensable for actual calculations. In this paper, we define the discrete Spingroup, which is a double cover of SO(m), and consider its actions on discrete functions. We show that this group-action makes the spaces Hk and Mk into Spin(m)-representations. We will often consider the compliance of our results to the results under the so(m, C)- action.

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