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arXiv 2409.07536hep-thgr-qchep-lat
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离散引力中的庞加莱不变性

Poincare Invariance in Discrete Gravity

Ludwig Maxmillian University(路德维希-马克西米利安大学);American University of Beirut(贝鲁特美国大学)

Ali H. Chamseddine, Mariam Khaldieh

AI总结:

本文提出通过扩展切空间到 ISO(d) 群,利用平移不变性代替微分不变性,从而在离散引力中实现庞加莱不变性。

摘要:

一种离散引力的 formulation 最近被提出,基于定义一个晶格和一个连接单元的位移算子。在这样的空间上,旋量将具有旋转 SO(d) 不变性,这被当作基本对称性。受晶格 QCD 的启发,定义了离散的曲率和扭力的类比,这些在连续极限下能平滑地过渡到相应的张量。在本文中,我们显示,缺乏微分不变性可以被要求在切空间中具有平移不变性来代替,通过将切空间从 SO(d) 扩展到不均匀洛伦兹群 ISO(d) 来包括平移。我们通过取李群 SO(d + 1) 并对其进行 Inonu-Wigner 缩放来获得 ISO(d) 对称性。我们显示,正如在连续空间中一样,零扭力约束将平移参数转换为微分参数,从而解释了这种 formulation 的有效性。

英文摘要:

A formulation of discrete gravity was recently proposed based on defining a lattice and a shift operator connecting the cells. Spinors on such a space will have rotational SO(d) invariance which is taken as the fundamental symmetry. Inspired by lattice QCD, discrete analogues of curvature and torsion were defined that go smoothly to the corresponding tensors in the continuous limit. In this paper, we show that the absence of diffeomorphism invariance could be replaced by requiring translational invariance in the tangent space by enlarging the tangent space from SO(d) to the inhomogeneous Lorentz group ISO(d) to include translations. We obtain the ISO(d) symmetry by taking instead the Lie group SO(d + 1) and perform on it Inonu-Wigner contraction. We show that, just as for continuous spaces, the zero torsion constraint converts the translational parameter to a diffeomorphism parameter, thus explaining the effectiveness of this formulation.

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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