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arXiv 1306.5820gr-qcastro-ph.SR
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牛顿引力下致密物体的有效action和线性响应

Effective action and linear response of compact objects in Newtonian gravity

Sayan Chakrabarti, Térence Delsate, Jan Steinhoff

摘要:

我们应用有效场论方法的引力相互作用的紧凑的恒星,发展范围内的广义相对论,牛顿引力。在这个有效的理论中,一个紧凑的物体被表示为一个具有一般引力多极矩的点粒子。多极子的时间演化依赖于外场的激励。这可以通过多极子对外加场的响应函数来正式描述。这种响应的极点对应于恒星的正常振荡模式。这引起了共振模式和潮汐力之间的二元系统。与牛顿引力中潮汐相互作用和共振的标准形式主义的联系。我们的方法可以应用于更复杂的情况。特别是,对广义相对论的推广是可能的。

英文摘要:

We apply an effective field theory method for the gravitational interaction of compact stars, developed within the context of general relativity, to Newtonian gravity. In this effective theory a compact object is represented by a point particle possessing generic gravitational multipole moments. The time evolution of the multipoles depends on excitations due to external fields. This can formally be described by a response function of the multipoles to applied fields. The poles of this response correspond to the normal oscillation modes of the star. This gives rise to resonances between modes and tidal forces in binary systems. The connection to the standard formalism for tidal interactions and resonances in Newtonian gravity is worked out. Our approach can be applied to more complicated situations. In particular, a generalization to general relativity is possible.

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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