强等效原理的空间检验：BepiColombo和日地拉格朗日点机会
Space tests of the strong equivalence principle: BepiColombo and the Sun-Earth Lagrangian points opportunity
摘要：
广义相对论的有效性，在100年后，得到了坚实的实验证据的支持。然而，人们对通过其他实验来推动精度极限很感兴趣。在这里，我们把注意力集中在等价原则，特别是强形式。地面实验和月球激光测距的结果提供了模拟强等效原理偏差的诺德维特参数η的最佳上限。其不确定度目前为σ[η] =4.4 $\times$ $10^{-4}$。在本文的第一部分，我们将描述实验，以测量η，这将是由未来的使命BepiColombo完成。η的预期精密度为$\approx$ $10^{-5}$。在第二部分中，我们将考虑地球和在日地拉格朗日点附近轨道运行的航天器之间的距离，以获得η的独立测量。在这种情况下，我们预测的约束类似于月球激光测距。
英文摘要：
The validity of General Relativity, after 100 years, is supported by solid experimental evidence. However, there is a lot of interest in pushing the limits of precision by other experiments. Here we focus our attention on the equivalence principle, in particular the strong form. The results of ground experiments and lunar laser ranging have provided the best upper limit on the Nordtvedt parameter η that models deviations from the strong equivalence principle. Its uncertainty is currently σ[η] =4.4 $\times$ $10^{-4}$. In the first part of this paper we will describe the experiment, to measure η, that will be done by the future mission BepiColombo. The expected precision on η is $\approx$ $10^{-5}$. In the second part we will consider the ranging between the Earth and a spacecraft orbiting near the Sun-Earth Lagrangian points to get an independent measurement of η. In this case, we forecast a constraint similar to that achieved by lunar laser ranging.
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