RIFT参数估计算法中广义进动参数的实现
Implementation of a generalized precession parameter in the RIFT parameter estimation algorithm
摘要：
自2015年首次发现引力波以来，在波形解释和致密二元源参数估计方面取得了重大进展。我们在此提出了广义进动参数$\langle χ_p \rangle$的实现，其在RIFT参数估计框架内对进动时间尺度上的所有角度变化进行平均。相对于最初提出的进动参数$χ_p$，它的特点是一个最大的动力学自旋的二进制，这个新的参数$\langle χ_p \rangle$有一个独特的域$1 < \langle χ_p \rangle < 2$，这是专为二进制与两个进动自旋。在回顾了这两个参数之间的物理差异之后，我们描述了$\langle χ_p \rangle$是如何在RIFT中实现的，并将其应用于Advanced LIGO和Advanced Virgo第三次运行（O3b）后半部分的所有36个事件。在O3b中，10个事件显示出显著的进动量$\langle χ_p \rangle > 0.5$。特别感兴趣的是GW191109_010717，我们发现它有一个$\sim28\%$的概率，起源系统必然包含两个错位的自旋。
英文摘要：
Since the initial discovery of gravitational waves in 2015, significant developments have been made towards waveform interpretation and estimation of compact binary source parameters. We present herein an implementation of the generalized precession parameter $\langle χ_p \rangle$, which averages over all angular variations on the precession timescale, within the RIFT parameter estimation framework. Relative to the originally-proposed precession parameter $χ_p$, which characterizes the single largest dynamical spin in a binary, this new parameter $\langle χ_p \rangle$ has a unique domain $1 < \langle χ_p \rangle < 2$, which is exclusive to binaries with two precessing spins. After reviewing the physical differences between these two parameters, we describe how $\langle χ_p \rangle$ was implemented in RIFT and apply it to all 36 events from the second half of the Advanced LIGO and Advanced Virgo third operating run (O3b). In O3b, ten events show significant amounts of precession $\langle χ_p \rangle > 0.5$. Of particular interest is GW191109_010717; we show it has a $\sim28\%$ probability that the originating system necessarily contains two misaligned spins.
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