更好的广义连接空间

Juan Orendain, Jose A. Zapata
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引用次数: 0

摘要

给定一个基流形 $M$ 和一个李群 $G$,我们定义 $\widetilde\{calA}_M$ 是一个在 $M$ 上的广义 $G$ 连接空间,它具有以下属性:- 光滑连接空间 ${cal A}^\infty_M = \sqcup_\pi {calA}^\infty_\pi$ 是密集嵌入在 $\widetilde{\cal A}_M = \sqcup_\pi\widetilde{cal A}^\infty_\pi$ 中的;此外,与通常的广义连接空间不同,该嵌入保留了拓扑扇形。- 它是环量化广义连接标准空间 $\bar{cal A}_M$ 的同质覆盖空间。- 它是一个可测空间,是作为有截点的连接空间的逆极限而构造的,与 $\bar{cal A}_M$ 非常相似。在截点的每一级,都可以定义哈量、BF 量和热核量。- 定义了闭合流形上广义连接的拓扑电荷:$Q=\int Tr(F)$ in 2d,$Q= \int Tr(F \wedge F)$ in 4d,等等。- 在细分流形上,它可以用与它的碎片相关的广义连接空间来计算。因此,边界连接空间可以从与面相关的空间中计算出来。- 广义连接的灵魂是为光滑连接定义的高同调平行传输概念。我们通过遗忘其高层次来恢复标准广义连接。- 我们的高轨距场的高层通常是微不足道的。然后$\widetilde{cal A}_\Sigma = \bar{cal A}_\Sigma$ for $\dim \Sigma = 3$ and$G=SU(2)$,但是$\widetilde{cal A}_M \neq \bar{cal A}_M$ for $\dim M = 4$ and$G=SL(2, {\mathbb C})$或$G=SU(2)$。环量子引力的边界数据与我们的广义连接空间是一致的,但具有洛伦兹或欧几里得特征的量子引力的路径积分会对同调数据敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A better space of generalized connections
Given a base manifold $M$ and a Lie group $G$, we define $\widetilde{\cal A}_M$ a space of generalized $G$-connections on $M$ with the following properties: - The space of smooth connections ${\cal A}^\infty_M = \sqcup_\pi {\cal A}^\infty_\pi$ is densely embedded in $\widetilde{\cal A}_M = \sqcup_\pi \widetilde{\cal A}^\infty_\pi$; moreover, in contrast with the usual space of generalized connections, the embedding preserves topological sectors. - It is a homogeneous covering space for the standard space of generalized connections of loop quantization $\bar{\cal A}_M$. - It is a measurable space constructed as an inverse limit of of spaces of connections with a cutoff, much like $\bar{\cal A}_M$. At each level of the cutoff, a Haar measure, a BF measure and heat kernel measures can be defined. - The topological charge of generalized connections on closed manifolds $Q= \int Tr(F)$ in 2d, $Q= \int Tr(F \wedge F)$ in 4d, etc, is defined. - On a subdivided manifold, it can be calculated in terms of the spaces of generalized connections associated to its pieces. Thus, spaces of boundary connections can be computed from spaces associated to faces. - The soul of our generalized connections is a notion of higher homotopy parallel transport defined for smooth connections. We recover standard generalized connections by forgetting its higher levels. - Higher levels of our higher gauge fields are often trivial. Then $\widetilde{\cal A}_\Sigma = \bar{\cal A}_\Sigma$ for $\dim \Sigma = 3$ and $G=SU(2)$, but $\widetilde{\cal A}_M \neq \bar{\cal A}_M$ for $\dim M = 4$ and $G=SL(2, {\mathbb C})$ or $G=SU(2)$. Boundary data for loop quantum gravity is consistent with our space of generalized connections, but a path integral for quantum gravity with Lorentzian or euclidean signatures would be sensitive to homotopy data.
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