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arXiv 1407.7814gr-qc
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Cartan规范引力的几何基础

Geometrical Foundations of Cartan Gauge Gravity

Gabriel Catren

摘要:

我们使用的嘉当连接的理论来分析的几何结构支撑的规范理论描述的引力相互作用。根据嘉当联系理论,定义广义相对论帕拉蒂尼公式基本变量的自旋联系$ω$和焊接形式$θ$可以理解为单个场的不同分量,即嘉当联系$A=ω+θ$。为了强调Ehresmann联络和Cartan联络概念之间的相似性和差异性,我们详细解释了如何通过束归约机制从赋予Ehresmann联络的$G$ -主丛$P_{G}\rightarrow M$(是$G$的子群的洛伦兹群$H$)得到Cartan几何$(P_{H}\rightarrow M, A)$.我们主张,这种约化必须理解为$P_{G}$的定域规范对称性的部分规范固定,也就是说,这种规范固定使得定域洛伦兹不变性“不被破坏”。然后,我们认为,“破碎”的对称性的一部分-这是内部的本地平移不变性-是隐含的保存不变性下的外部的$M$的非同构。

英文摘要:

We use the theory of Cartan connections to analyze the geometrical structures underpinning the gauge-theoretical descriptions of the gravitational interaction. According to the theory of Cartan connections, the spin connection $ω$ and the soldering form $θ$ that define the fundamental variables of the Palatini formulation of general relativity can be understood as different components of a single field, namely a Cartan connection $A=ω+θ$. In order to stress both the similarities and the differences between the notions of Ehresmann connection and Cartan connection, we explain in detail how a Cartan geometry $(P_{H}\rightarrow M, A)$ can be obtained from a $G$-principal bundle $P_{G}\rightarrow M$ endowed with an Ehresmann connection (being the Lorentz group $H$ a subgroup of $G$) by means of a bundle reduction mechanism. We claim that this reduction must be understood as a partial gauge fixing of the local gauge symmetries of $P_{G}$, i.e. as a gauge fixing that leaves "unbroken" the local Lorentz invariance. We then argue that the "broken" part of the symmetry--that is the internal local translational invariance--is implicitly preserved by the invariance under the external diffeomorphisms of $M$.

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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