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arXiv 1408.5261gr-qc
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Schwarzschild时空中四极体的动力学

Dynamics of quadrupolar bodies in a Schwarzschild spacetime

Donato Bini, Andrea Geralico

摘要:

本文在Schwarzschild背景下,根据Dixon模型,研究了具有多极结构的扩展体的动力学行为,扩展了前人的工作。在四极张量坐标系分量不变和质心运动限制在赤道面上的简化假设下,对整个演化方程组进行了数值积分,自旋矢量与之正交。运动方程也在与自旋和四极子有关的特征长度尺度的小值的限制下解析求解。背景曲率特征长度。结果是定性和定量不同于以往的分析只涉及自旋结构。特别是,四极子的存在被证明是负责非零自旋角动量的开始,即使最初不存在。

英文摘要:

The dynamics of extended bodies endowed with multipolar structure up to the mass quadrupole moment is investigated in the Schwarzschild background according to the Dixon's model, extending previous works. The whole set of evolution equations is numerically integrated under the simplifying assumptions of constant frame components of the quadrupole tensor and that the motion of the center of mass be confined on the equatorial plane, the spin vector being orthogonal to it. The equations of motion are also solved analytically in the limit of small values of the characteristic length scales associated with the spin and quadrupole with respect to the background curvature characteristic length. The results are qualitatively and quantitatively different from previous analyses involving only spin structures. In particular, the presence of the quadrupole turns out to be responsible for the onset of a non-zero spin angular momentum, even if initially absent.

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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