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arXiv 2401.04205hep-th
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共形几何代数与伽利略时空

Conformal Geometric Algebra and Galilean Spacetime

Universidade de Brasília(巴西利亚大学)

G X A Petronilo

AI总结:

本文探讨了几何代数在伽利略时空中的应用及其物理意义,提出伽利略时空代数(GSTA)并展示其在表示伽利略变换、旋转和boost中的用途,通过几何代数视角推导伽利略电磁学并将其还原为麦克斯韦方程,引入伽利略旋量并建立GSTA与Majernik双数的关系。

摘要:

本文探讨了几何代数在伽利略时空中的应用及其物理意义。我们引入伽利略时空代数(GSTA),一种由特定度规生成的五维共形几何代数(CGA),并展示其在表示特殊伽利略变换、旋转和boost中的用途。推导了GSTA中特殊伽利略变换的一般形式,证明其保持性。虽然伽利略电磁学的张量形式已建立,但我们的工作从几何代数视角出发,利用GSTA推导其并展示其在非相对论极限下如何无缝还原为熟悉的麦克斯韦方程。本研究的重要方面是引入伽利略旋量作为GSTA的最小左理想元素。我们展示了如何利用这些旋量构造自由电子的Lévy-Leblond方程及其对应的矩阵表示。此外,我们建立了GSTA与Majernik引入的四分量双数之间的联系,建议了发展牛顿引力协变形式的路径。本文不仅澄清了伽利略对称性的几何解释,还为非相对论物理的未来研究开辟了新途径,突显了在该背景下使用CGA的优势。

英文摘要:

This paper explores the application of geometric algebra to Galilean spacetime and its physical implications. We introduce the Galilean Spacetime Algebra (GSTA), a five-dimensional conformal geometric algebra (CGA) generated by a specific metric, and demonstrate its utility in representing special Galilean transformations, rotations, and boosts. The general form of special Galilean transformations within the GSTA is derived, demonstrating their preservation. While the tensor formulation of Galilean electromagnetism is well-established, our work offers a fresh insight by deriving it from a geometric algebra perspective, utilizing the GSTA, and demonstrates how it seamlessly reduces to the familiar Maxwell equations in the non-relativistic limit. A significant aspect of this research is the introduction of Galilean spinors as elements of the minimal left ideals of the GSTA. We illustrate how these spinors can be utilized to construct the Lévy-Leblond equation for a free electron, along with its corresponding matrix representation. Furthermore, we establish a connection between the GSTA and the four-component dual numbers introduced by Majernik, suggesting pathways for developing a covariant formulation of Newtonian gravity. This work not only clarifies the geometric interpretation of Galilean symmetries but also opens avenues for future research in non-relativistic physics, highlighting the advantages of using CGA in this context.

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