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arXiv 1408.5484gr-qc
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Kerr时空中的扩展体:探索一般四极张量的作用

Extended bodies in a Kerr spacetime: exploring the role of a general quadrupole tensor

Donato Bini, Andrea Geralico

摘要:

在Mathisson-Papapetrou-Dixon模型的框架下研究了Kerr时空中扩展体的赤道运动,包括四极张量的全部有效分量.相关方程的数值积分显示了质量和电流四极矩分量的具体作用。虽然大多数关于这一主题的文献仅限于自旋诱导(纯电)四极张量,本分析突出了一个完全通用的四极张量的动态效果。磁性部件的贡献确实与许多有趣的特征有关,例如,增强的轨道向内/向外螺旋行为和类似自旋翻转的效应,这可能有观测对应物。最后,通过具体算例讨论了Mathisson-Papapetrou-Dixon模型的有效性极限.

英文摘要:

The equatorial motion of extended bodies in a Kerr spacetime is investigated in the framework of the Mathisson-Papapetrou-Dixon model, including the full set of effective components of the quadrupole tensor. The numerical integration of the associated equations shows the specific role of the mass and current quadrupole moment components. While most of the literature on this topic is limited to spin-induced (purely electric) quadrupole tensor, the present analysis highlights the effect of a completely general quadrupole tensor on the dynamics. The contribution of the magnetic-type components is indeed related to a number of interesting features, e.g., enhanced inward/outward spiraling behavior of the orbit and spin-flip-like effects, which may have observational counterparts. Finally, the validity limit of the Mathisson-Papapetrou-Dixon model is also discussed through explicit examples.

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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