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arXiv 2408.01809gr-qchep-thmath-phmath.MP
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4D引力一阶对称性的新边界模与角电荷

New edge modes and corner charges for first-order symmetries of 4D gravity

Simon Langenscheidt, Daniele Oriti

AI总结:

本文在四维引力标架-联络表述中构造了非对易标架平移对称性,将微分同胚表示为复合变换,揭示了局部类似庞加莱群但含结构函数的边界模与电荷结构,并提出了面向量子引力的离散化策略。

摘要:

我们提出了一组在四维引力中、以标架-联络变量表述的非对易标架平移对称性,它们允许将微分同胚表示为复合变换。在有限区域的相空间层面上工作时,我们特别关注生成元的角项部分,讨论了各种可能的电荷括号、电荷的相对定义、与旋量的耦合以及与其他电荷的关系。由此浮现出的图景是:引力的对称性和边界模在局部上类似于庞加莱群 $SO(1,3)\ltimes \mathbb{R}^{1,3}$,但具有结构函数。特别地,我们认为本文所提出的对称性和电荷更适合离散化,并针对面向量子引力应用的该电荷代数勾勒了一种策略。

英文摘要:

We present a set of noncommuting frame-translation symmetries in 4D gravity in tetrad-connection variables, which allow expressing diffeomorphisms as composite transformations. Working on the phase space level for finite regions, we pay close attention to the corner piece of the generators, discuss various possible charge brackets, relative definitions of the charges, coupling to spinors and relations to other charges. What emerges is a picture of the symmetries and edge modes of gravity that bears local resemblance to a Poincare group $SO(1,3)\ltimes \mathbb{R}^{1,3}$, but possesses structure functions. In particular, we argue that the symmetries and charges presented here are more amenable to discretisation, and sketch a strategy for this charge algebra, geared toward quantum gravity applications.

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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