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arXiv 1708.04578physics.class-ph
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关于电动力学中非对称张量的守恒性angular momentum

About conservation the angular momentum for asymmetric tensors in electrodynamics

Yurii A. Spirichev

摘要:

通常认为,对于非对称的能量-动量张量,角动量守恒定律是不成立的。这就是批评闵可夫斯基张量和其他非对称能量动量张量的原因。本文证明了由非对称张量的全散度形式导出的能量守恒和动量守恒定律与其对称部分的散度等价。证明了非对称张量的反对称部分的总发散恒为零。由此可见,对于非对称的能量-动量张量,角动量守恒定律也是成立的。结果表明,真空的闵可夫斯基张量的线性不变量不对应于电磁场的二次不变量。这表明闵可夫斯基张量和三维应力张量的线性不变量是不正确的。

英文摘要:

It is customary to assume that the law of conservation of the angular momentum is violated for an asymmetric energy-momentum tensors. This is the reason for criticizing the Minkowski tensor and other asymmetric energy-momentum tensors. In this paper, it is shown that the laws of conservation of energy and momentum following from an asymmetric tensor in the form of its total divergence are equivalent to the divergence of its symmetric part. It is shown that the total divergence of the antisymmetric part of the asymmetric tensor is identically zero. From this, it follows that for the asymmetric energy-momentum tensor the law of conservation of the angular momentum is also fulfilled. It is shown that the linear invariant of the Minkowski tensor for a vacuum does not correspond to the quadratic invariant of the electromagnetic field. This indicates that the linear invariant of the Minkowski tensor and the three-dimensional stress tensor are not correct.

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