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arXiv 1802.05281gr-qchep-th
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快速自我激励

Fast Self-forced Inspirals

Maarten van de Meent, Niels Warburton

摘要:

我们提出了一种新的,快速的方法来计算螺旋轨迹和引力波从极端的质量比inspirals,可以将所有已知的(和未来的)自作用力的结果。使用近身份(平均)变换,我们制定的运动方程,不明确依赖于轨道相位的inspiral,使他们快速评估,其解决方案跟踪不断变化的运动常数,轨道相位和波形相位的一个完整的自作用力inspiral $O(η)$,其中$η$是(小)质量比。作为一个具体的例子,我们实现这些方程的非自旋(史瓦西)二进制的inspirals。我们的代码计算inspiral轨迹在毫秒,这是一个速度的2-5个数量级(取决于质量比)比以前的自我力量inspiral模型,需要几分钟到几个小时来评估。使用我们的新模型计算两年的持续时间波形,我们发现不匹配优于$\sim 10^{-4}$相对于使用(较慢)全自作用力模型计算的波形。我们的新方法的速度与组装模型相当,但具有易于合并自作用力结果的额外好处,一旦已知,就可以在螺旋上跟踪波形相位到亚弧度精度。

英文摘要:

We present a new, fast method for computing the inspiral trajectory and gravitational waves from extreme mass-ratio inspirals that can incorporate all known (and future) self-force results. Using near-identity (averaging) transformations we formulate equations of motion that do not explicitly depend upon the orbital phases of the inspiral, making them fast to evaluate, and whose solutions track the evolving constants of motion, orbital phases and waveform phase of a full self-force inspiral to $O(η)$, where $η$ is the (small) mass ratio. As a concrete example, we implement these equations for inspirals of non-spinning (Schwarzschild) binaries. Our code computes inspiral trajectories in milliseconds which is a speed up of 2-5 orders of magnitude (depending on the mass-ratio) over previous self-force inspiral models which take minutes to hours to evaluate. Computing two-year duration waveforms using our new model we find a mismatch better than $\sim 10^{-4}$ with respect to waveforms computed using the (slower) full self-force models. The speed of our new approach is comparable with kludge models but has the added benefit of easily incorporating self-force results which will, once known, allow the waveform phase to be tracked to sub-radian accuracy over an inspiral.

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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