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arXiv 1502.01473gr-qcastro-ph.EPastro-ph.GAphysics.space-ph
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大质量环的引力电磁效应

Gravito-electromagnetic Effects of Massive Rings

Matteo Luca Ruggiero

摘要:

线性后牛顿近似下的爱因斯坦场方程可以用电磁学来类比,即所谓的引力-电磁形式主义。我们用这个类比来研究大质量环的引力场:特别地,我们考虑了围绕中心体的开普勒轨道上的连续质量分布,并且我们计算了由这种质量分布在中心体和环之间的中间区产生的引力场,重点是源于环旋转的重磁分量。在这样做的时候,我们推广和补充一些以前的结果,专注于纯牛顿效应的环(从而忽略其旋转)或适用于旋转球壳的情况下。最后,我们研究了在一些简单的情况下,环的旋转的效果,并建议,在原则上,这种方法可以用来推断环的角动量的信息。

英文摘要:

The Einstein field equations in linear post-Newtonian approximation can be written in analogy with electromagnetism, in the so-called gravito-electromagnetic formalism. We use this analogy to study the gravitational field of a massive ring: in particular, we consider a continuous mass distribution on Keplerian orbit around a central body, and we work out the gravitational field generated by this mass distribution in the intermediate zone between the central body and the ring, focusing on the gravito-magnetic component that originates from the rotation of the ring. In doing so, we generalize and complement some previous results that focused on the purely Newtonian effects of the ring (thus neglecting its rotation) or that were applied to the case of rotating spherical shells. Eventually, we study in some simple cases the effect of the the rotation of the ring, and suggest that, in principle, this approach could be used to infer information about the angular momentum of the ring.

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