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arXiv 0811.3926gr-qc
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自由降落普遍性的地球物理检验

Geophysical test of the universality of free-fall

Sachie Shiomi

摘要:

指出自由降落的普遍性可以通过观测地球表面重力变化来检验。地球的内核与地球的其余部分主要通过引力弱耦合。如果违反了自由降落的普遍性,由于它们的化学成分和/或结合能的质量分数不同,内核和地球的其余部分将以不同的速率落向太阳和其他引力场的来源。可以观察到不同的加速度作为表面重力效应。通过假设一个简单的地球模型,我们讨论了预期的违反普遍性的表面重力效应和实验,寻找这样的效果,使用超导重力仪。结果表明,使用目前运行的超导重力仪,通用性可以测试到10 $^{-9}$的水平。通过将全球测量与先进数据分析的应用相结合,可以预期会有一些改进。

英文摘要:

We point out that the universality of free-fall can be tested by observing surface-gravity changes of the Earth. The Earth's inner core is weakly coupled to the rest part of the Earth by mainly gravitational forces. If there were a violation of the universality of free-fall, because of their different chemical compositions and/or of different mass fractions of binding energies, the inner core and the rest part of the Earth would fall at different rates towards the Sun and other sources of gravitational fields. The differential acceleration could be observed as surface-gravity effects. By assuming a simple Earth model, we discuss the expected surface-gravity effects of violations of the universality and experiments to search for such effects by using superconducting gravimeters. It is shown that the universality can be tested to a level of 10$^{-9}$ using currently operating superconducting gravimeters. Some improvements can be expected from combinations of global measurements and applications of advanced data analyses.

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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