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arXiv 1402.6708gr-qc
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三维单纯引力的一维action

A one-dimensional action for simplicial gravity in three dimensions

Wolfgang M. Wieland

摘要:

本文从一维旋量作用量出发,导出了Ponzano-Regge模型。该结构从一阶Palatini形式主义在三个维度上开始。然后,我们介绍了一个简单的分解的三维流形和研究的离散行动的spinorial表示圈重力。沿着离散化的边缘的一维细化限制使我们回到连续体制剂。三维作用量转化为单形流形单骨架上的线积分。所有的场都是连续的,但只在一维边上有支持。定义了局域规范轨道上的路径积分,并通过通常的Faddeev-Popov方法去掉了多余的积分。由此产生的状态和模型再现的Ponzano-Regge振幅。

英文摘要:

This article presents a derivation of the Ponzano--Regge model from a one-dimensional spinor action. The construction starts from the first-order Palatini formalism in three dimensions. We then introduce a simplicial decomposition of the three-dimensional manifold and study the discretised action in the spinorial representation of loop gravity. A one-dimensional refinement limit along the edges of the discretisation brings us back to a continuum formulation. The three-dimensional action turns into a line integral over the one-skeleton of the simplicial manifold. All fields are continuous but have support only along the one-dimensional edges. We define the path integral, and remove the redundant integrals over the local gauge orbits through the usual Faddeev--Popov procedure. The resulting state sum model reproduces the Ponzano--Regge amplitudes.

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