标题： 一种在先进探测器时代观测进动致密双星合并的搜索技术 显示英文标题

标题： A search technique to observe precessing compact binary mergers in the advanced detector era

摘要： 通过匹配滤波搜索，可以最有效地识别来自致密双星合并的引力波信号，这种搜索方法将数据与预先生成的引力波模板库进行匹配。 尽管存在不同的执行匹配滤波以及生成模板库的技术，但目前所有建模的引力波搜索都使用限制组件自旋与轨道角动量对齐（或反向对齐）的模板。 这意味着当前的搜索对于由具有通用自旋（进动）的双星产生的引力波信号不那么敏感，这表明可能有相当一部分信号未被检测到。 在本工作中，我们引入了一种对进动双星产生的信号敏感的匹配滤波搜索，并且可以在引力波观测运行中实际使用。 我们利用了来自进动双星的引力波信号可以分解为五个谐波的幂级数这一事实，证明需要一个仅比现有对齐自旋模板库大$\sim 3\times$的通用自旋模板库，以使总质量大于$17.5\, M_{\odot}$且平面内自旋为$>0.67$的中子星黑洞双星的灵敏体积增加$\sim 100\%$。 实际上，对于平面内自旋不显著的中子星黑洞信号，我们的通用自旋搜索表现与现有的对齐自旋搜索相当，但在整个通用自旋参数空间中平均提高了$\sim60\%$的灵敏度。 我们预计，这种改进的技术将识别出更多的引力波信号，并最终帮助揭示宇宙中双星未知的自旋分布。 显示英文摘要

摘要： Gravitational-wave signals from compact binary coalescences are most efficiently identified through matched filter searches, which match the data against a pre-generated bank of gravitational-wave templates. Although different techniques for performing the matched filter, as well as generating the template bank, exist, currently all modelled gravitational-wave searches use templates that restrict the component spins to be aligned (or anti-aligned) with the orbital angular momentum. This means that current searches are less sensitive to gravitational-wave signals generated from binaries with generic spins (precessing), suggesting that, potentially, a significant fraction of signals may remain undetected. In this work we introduce a matched filter search that is sensitive to signals generated from precessing binaries and can realistically be used during a gravitational-wave observing run. We take advantage of the fact that a gravitational-wave signal from a precessing binary can be decomposed into a power series of five harmonics, to show that a generic-spin template bank, which is only $\sim 3\times$ larger than existing aligned-spin banks, is needed to increase our sensitive volume by $\sim 100\%$ for neutron star black hole binaries with total mass larger than $17.5\, M_{\odot}$ and in-plane spins $>0.67$. In fact, our generic spin search performs as well as existing aligned-spin searches for neutron star black hole signals with insignificant in-plane spins, but improves sensitivity by $\sim60\%$ on average across the full generic spin parameter space. We anticipate that this improved technique will identify significantly more gravitational-wave signals, and, ultimately, help shed light on the unknown spin distribution of binaries in the universe.