Quasinormal-mode filters: A new approach to analyze the gravitational-wave ringdown of binary black-hole mergers
Quasinormal-mode filters: A new approach to analyze the gravitational-wave ringdown of binary black-hole mergers
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DOI：
10.1103/physrevd.106.084036
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发表时间：
2022-07
影响因子：
5
通讯作者：
Sizheng Ma;Keefe Mitman;Ling Sun;N. Deppe;F. H'ebert;Lawrence E. Kidder;Jordan Moxon;William Throwe;Nils L. Vu;Yanbei Chen
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作者：
Sizheng Ma;Keefe Mitman;Ling Sun;N. Deppe;F. H'ebert;Lawrence E. Kidder;Jordan Moxon;William Throwe;Nils L. Vu;Yanbei Chen
我们提出了两个频量滤波器，以分析二进制黑洞合并的环形信号。早期的Inspiral信号琐碎的方式 - 仅在过滤量后的时间和相位，我们可以通过将我们的过滤器应用于GW150914的数字相对性（NR），从而可视化各种子效果（l = 2，m = 2在另一个NR模拟中，谐波和混合模式（L = 2，M = 1）。旋转），因此有潜在的应用于将来的数据分析，并且参数估计。
We propose two frequency-domain filters to analyze ringdown signals of binary black hole mergers. The first rational filter is constructed based on a set of (arbitrary) quasi-normal modes (QNMs) of the remnant black holes, whereas the second full filter comes from the transmissivity of the remnant black holes. The two filters can remove corresponding QNMs from original time-domain ringdowns, while changing early inspiral signals in a trivial way — merely a time and phase shift. After filtering out dominant QNMs, we can visualize the existence of various subdominant effects. For example, by applying our filters to a GW150914-like numerical relativity (NR) waveform, we find second-order effects in the ( l = 4 , m = 4) , ( l = 5 , m = 4) and ( l = 5 , m = 5) harmonics; the spherical-spheroidal mixing mode in the ( l = 2 , m = 2) harmonic; and a mixing mode in the ( l = 2 , m = 1) harmonic due to a gravitational recoil. In another NR simulation where two component spins are anti-aligned with the orbital angular momentum, we also find retrograde modes. Additionally, we propose to use the rational filter to estimate the start time of a QNM. The filters are sensitive to the remnant properties (i.e., mass and spin) and thus have a potential application to future data analyses and parameter estimations. We also investigate the stability of the full filter. Its connection to the instability of QNM spectra is discussed.