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arXiv 0907.1999gr-qchep-th
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任意维Einstein-Cartan action的平移不变性

Translational invariance of the Einstein-Cartan action in any dimension

N. Kiriushcheva, S. V. Kuzmin

摘要:

我们证明,从一阶制定的爱因斯坦-嘉当行动,它是可能的,以获得基本的微分恒等式,导致平移不变性的行动在切空间。场的变换被明确地写为一阶和二阶公式,并研究了变换的群性质。这一点,结合哈密顿公式(arXiv:0907.1553 [gr-qc])的初步结果,使我们能够得出这样的结论:在没有任何修改的情况下,在大于2的任何维度上的爱因斯坦-嘉当作用量不仅具有旋转不变性,而且具有\textit{translational invariance in the tangent space}的形式。我们认为,\textit{not}只有一个完整的哈密顿分析可以明确地给出一个答案的问题是什么规范对称性,但也纯拉格朗日方法允许我们找到相同的规范对称性从\textit{basic}微分恒等式。

英文摘要:

We demonstrate that from the first order formulation of the Einstein-Cartan action it is possible to derive the basic differential identity that leads to translational invariance of the action in the tangent space. The transformations of fields is written explicitly for both the first and second order formulations and the group properties of transformations are studied. This, combined with the preliminary results from the Hamiltonian formulation (arXiv:0907.1553 [gr-qc]), allows us to conclude that without any modification, the Einstein-Cartan action in any dimension higher than two possesses not only rotational invariance but also a form of \textit{translational invariance in the tangent space}. We argue that \textit{not} only a complete Hamiltonian analysis can unambiguously give an answer to the question of what a gauge symmetry is, but also the pure Lagrangian methods allow us to find the same gauge symmetry from the \textit{basic} differential identities.

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