论文标题
应对检测时间重叠紧凑型二元合并的挑战
Addressing the challenges of detecting time-overlapping compact binary coalescences
论文作者
论文摘要
瞬态重力波的标准检测和分析技术使得检测器数据最多可以随时包含一个信号。随着探测器的敏感性提高,此假设将不再有效。在本文中,我们研究了当前的瞬时重力波的搜索技术如何在一个以上信号的存在下行为。我们对包含时间重叠的紧凑型二进制合并的数据集进行搜索。这包括一个建模的,匹配的过滤器搜索(PYCBC),以及一个未建模的连贯搜索,连贯的Woveburst(CWB)。这两种搜索均由Ligo-Virgo-Kagra合作使用。我们发现,当信号在合并时间不同时,两个搜索都可以正确识别两个信号,$ |ΔT_C| \ geq 1 $ second,pycbc仅损失了$ 1 \%$的信号,以重叠二进制黑洞合并。两个管道都可以在区域内找到信号配对$ |ΔT_C| <1 $秒。但是,管道中的聚类例程只会导致恢复两个信号之一,因为效率降低了。在该区域内,我们发现CWB可以识别这两个信号。我们还发现,可以修改匹配的过滤器搜索以提供每个信号的正确参数的估计。
Standard detection and analysis techniques for transient gravitational waves make the assumption that detector data contains, at most, one signal at any time. As detectors improve in sensitivity, this assumption will no longer be valid. In this paper we examine how current search techniques for transient gravitational waves will behave under the presence of more than one signal. We perform searches on data sets containing time-overlapping compact binary coalescences. This includes a modelled, matched filter search (PyCBC), and an unmodelled coherent search, coherent WaveBurst (cWB). Both of these searches are used by the LIGO-Virgo-KAGRA collaboration. We find that both searches are capable of identifying both signals correctly when the signals are dissimilar in merger time, $|Δt_c| \geq 1$ second, with PyCBC losing only $1\%$ of signals for overlapping binary black hole mergers. Both pipelines can find signal pairings within the region $|Δt_c| < 1$ second. However, clustering routines in the pipelines will cause only one of the two signals to be recovered, as such the efficiency is reduced. Within this region, we find that cWB can identify both signals. We also find that matched filter searches can be modified to provide estimates of the correct parameters for each signal.