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arXiv 1204.4339gr-qcmath.CTmath.DG
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作为高规范理论的遥平行引力

Teleparallel Gravity as a Higher Gauge Theory

John C. Baez, Derek K. Wise

摘要:

我们表明,广义相对论可以被看作是一个更高的规范理论,涉及一个范畴群,或2群,称为teleparallel 2群。在任何半黎曼流形M上,我们首先构造一个主2-丛,它的结构2-群是Poincare 2-群。M上的任何平坦度量保持联络都给出这个2-丛上的平坦2-联络,而这个2-联络的关键成分是挠。相反,如果M是单连通的,并且具有为零的第二deRham上同调,则这个2-丛上的每一个平坦严格2-联络都以这种方式产生。从庞加莱2-群扩展到远程并行2-群,2-连接包括一个额外的部分:上框架域。利用广义相对论的遥平行重构,它使用了一个共框架场,一个平坦的连接和它的扭转,这让我们重写广义相对论作为一个理论与遥平行2-群的2-连接作为其唯一的领域。

英文摘要:

We show that general relativity can be viewed as a higher gauge theory involving a categorical group, or 2-group, called the teleparallel 2-group. On any semi-Riemannian manifold M, we first construct a principal 2-bundle with the Poincare 2-group as its structure 2-group. Any flat metric-preserving connection on M gives a flat 2-connection on this 2-bundle, and the key ingredient of this 2-connection is the torsion. Conversely, every flat strict 2-connection on this 2-bundle arises in this way if M is simply connected and has vanishing 2nd deRham cohomology. Extending from the Poincare 2-group to the teleparallel 2-group, a 2-connection includes an additional piece: a coframe field. Taking advantage of the teleparallel reformulation of general relativity, which uses a coframe field, a flat connection and its torsion, this lets us rewrite general relativity as a theory with a 2-connection for the teleparallel 2-group as its only field.

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