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arXiv 1808.06237gr-qc
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引力波、Wyman时空和自由落体观测者的能量动量张量

The energy-momentum tensor of gravitational waves, Wyman spacetime and freely falling observers

J. B. Formiga

摘要:

在广义相对论(GR)中,引力的能量动量张量(EMTG)的一个好的定义是一个困难的,如果不是不可能的,任务。另一方面,在它的远程并行版本中,被称为广义相对论的远程并行等价物(TEGR),人们可以以一种非常令人满意的方式定义EMTG。本文证明了线性化引力波(GWs)的TEGR的EMTG与文献中通常给出的GR的形式相同。此外,在自由下降帧(FFF)中获得了具有$+$偏振的$pp-$波的EMTG的精确版本。与前面的情况不同,能量密度可以是正的,也可以是负的,这取决于波的细节。在静态坐标系和FFF坐标系下,得到了Wyman时空的引力能量密度。事实证明,观察者在自由降落时可以测量重力的影响。

英文摘要:

A good definition for the energy momentum tensor of gravity (EMTG) in General Relativity (GR) is a hard, if not impossible, task. On the other hand, in its teleparallel version, known as The Teleparallel Equivalent of General Relativity (TEGR), one can define the EMTG in a very satisfactory way. In this paper, it is proved that the EMTG of TEGR for linearized gravitational waves (GWs) is the same as the version of GR that is usually given in the literature. In addition, the exact version of the EMTG for a $pp-$wave with a $+$ polarization is obtained in a freely falling frame (FFF). Unlike the previous case, the energy density can be either positive or negative, depending on the details of the wave. The gravitational energy density for the Wyman spacetimes is obtained both in a static frame and in a FFF. It turns out that observers in free fall can measure the effects of gravity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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