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arXiv 0709.1928gr-qcmath.DG
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论爱因斯坦方程的自然性

On the naturalness of Einstein's equation

Jose Navarro, Juan B. Sancho

摘要:

我们计算所有的2-协变张量自然地从一个半黎曼度量是发散自由的,重量大于-2。因此,它遵循爱因斯坦张量作为唯一的、直到常数因子的2-协变张量的表征,该2-协变张量自然地从半黎曼度量构造,该半黎曼度量是无发散的并且具有权重0(即,与单位无关)。由于相对论时空的能量动量张量也满足这两个条件,我们详细讨论了这些定理如何导出广义相对论的场方程。

英文摘要:

We compute all 2-covariant tensors naturally constructed from a semiriemannian metric which are divergence-free and have weight greater than -2. As a consequence, it follows a characterization of the Einstein tensor as the only, up to a constant factor, 2-covariant tensor naturally constructed from a semiriemannian metric which is divergence-free and has weight 0 (i.e., is independent of the unit of scale). Since these two conditions are also satisfied by the energy-momentum tensor of a relativistic space-time, we discuss in detail how these theorems lead to the field equation of General Relativity.

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