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arXiv 0902.4077gr-qc
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黑洞双星的动量流:I.内旋波和自旋诱导波的后牛顿分析

Momentum Flow in Black Hole Binaries: I. Post-Newtonian Analysis of the Inspiral and Spin-Induced Bobbing

Drew Keppel, David A. Nichols, Yanbei Chen, Kip S. Thorne

摘要:

简要介绍了一个新的加州理工学院/康奈尔大学的研究计划,探索弯曲时空的非线性动力学的双黑洞碰撞和合并,并在这个计划的初步项目,旨在阐明在黑洞双星(BBHs)的线性动量流。讨论了边带黑洞中线性动量局域化的“规范依赖性”(任意性),并希望线性动量的定性行为与规范无关。调和坐标建议作为一个可能的首选基础固定与线性动量的规范。对于BBH或其他紧致双星,朗道-李福席兹形式主义被用来定义双星的动量,即在物体表面或内部的积分,并定义物体外部的引力场(时空曲率)的动量,作为对场动量密度的体积积分。这些定义将在随后的论文中使用,通过数值相对论探索BBHs的内部非线性动力学。在1.5PN近似下,我们用这种形式来研究双星在轨道内旋过程中,双星体与其引力场之间的动量流。特别注意的是动量流和守恒与同步自旋引起的摆动的黑洞,在所谓的“极端踢配置”(其中两个相同的黑洞有他们的自旋躺在他们的轨道平面和反对齐)。

英文摘要:

A brief overview is presented of a new Caltech/Cornell research program that is exploring the nonlinear dynamics of curved spacetime in binary black hole collisions and mergers, and of an initial project in this program aimed at elucidating the flow of linear momentum in black-hole binaries (BBHs). The "gauge-dependence" (arbitrariness) in the localization of linear momentum in BBHs is discussed, along with the hope that the qualitative behavior of linear momentum will be gauge-independent. Harmonic coordinates are suggested as a possibly preferred foundation for fixing the gauge associated with linear momentum. For a BBH or other compact binary, the Landau-Lifshitz formalism is used to define the momenta of the binary's individual bodies in terms of integrals over the bodies' surfaces or interiors, and define the momentum of the gravitational field (spacetime curvature) outside the bodies as a volume integral over the field's momentum density. These definitions will be used in subsequent papers that explore the internal nonlinear dynamics of BBHs via numerical relativity. This formalism is then used, in the 1.5PN approximation, to explore momentum flow between a binary's bodies and its gravitational field during the binary's orbital inspiral. Special attention is paid to momentum flow and conservation associated with synchronous spin-induced bobbing of the black holes, in the so-called "extreme-kick configuration" (where two identical black holes have their spins lying in their orbital plane and antialigned).

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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