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arXiv 2010.07073gr-qc
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一般形式的广义协变引力理论的能量动量赝张量和超势

Energy-momentum pseudotensor and superpotential for generally covariant theories of gravity of general form

R. V. Ilin, S. A. Paston

摘要:

本文研究了能量动量赝张量的一般形式及其相应的超势。对这样一个理论的唯一要求是作用的一般协方差,而对其中自变量的导数的阶数或它们的变换律没有任何限制。由于广义Noether程序,我们得到了一个经常性的链的方程,它允许一个表示为一个发散的超势规范PEMT。给出了该超势的显式表达式。我们讨论所获得的表达式的结构和条件所得到的PEMT守恒律得到满足独立(全部或部分)的运动方程。变形的超势形式的理论与行动中的独立变量的变化也被认为是。我们将这些结果应用到一些有趣的特殊情况:广义相对论及其修正,特别是模仿重力和Regge-Teitelboim嵌入重力。

英文摘要:

The current paper is devoted to the investigation of the general form of the energy-momentum pseudotensor (pEMT) and the corresponding superpotential for the wide class of theories. The only requirement for such a theory is the general covariance of the action without any restrictions on the order of derivatives of the independent variables in it or their transformation laws. As a result of the generalized Noether procedure, we obtain a recurrent chain of the equations, which allows one to express canonical pEMT as a divergence of the superpotential. The explicit expression for this superpotential is also given. We discuss the structure of the obtained expressions and the conditions for the derived pEMT conservation laws to be satisfied independently (fully or partially) of the equations of motion. Deformations of the superpotential form for theories with a change of the independent variables in the action are also considered. We apply these results to some interesting particular cases: General Relativity and its modifications, particularly mimetic gravity and Regge-Teitelboim embedding gravity.

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