论文标题

校准不确定性对重力波源的哈勃恒定测量的影响

Impact of calibration uncertainties on Hubble constant measurements from gravitational-wave sources

论文作者

Huang, Yiwen, Chen, Hsin-Yu, Haster, Carl-Johan, Sun, Ling, Vitale, Salvatore, Kissel, Jeffrey S.

论文摘要

电磁上明亮的紧凑型二元合并的引力波(GW)检测可以提供对哈勃常数$ H_0 $的独立测量。为了获得一个可以帮助$ H_0 $仲裁的张力的测量值,需要完全了解这种方法的系统偏见。在这项研究中,我们旨在了解仪器校准误差(CES)对亮度距离的测量值,$ d_l $和推断的$ H_0 $值的影响。我们模拟了二进制中子星(BNSS),如高级Ligo和高级处女座干涉仪的设计敏感性所检测到的。我们人为地添加与Ligo-Virgo的第三次观察跑(O3)中经历的异常值相等的CE。我们发现,对于以网络信号噪声比为50的单个BNSS,$ d_l $的系统错误 - 因此,$ h_0 $ - 仍然小于统计不确定性。当我们结合多个事件以获得$ H_0 $的联合后验时,这些偏见变得更加重要。在相当不现实的情况下,每个检测周围的数据受到与最差O3罪犯相对应的相同的CE的影响,在我们组合$ \ sim $ 40来源之后,真正的$ H_0 $值将从90%可信间隔中排除。相反,如果有10%的来源遭受严重的CES,那么即使在100个来源后,90%可靠的间隔也包含了$ H_0 $的真实价值。

Gravitational-wave (GW) detections of electromagnetically bright compact binary coalescences can provide an independent measurement of the Hubble constant $H_0$. In order to obtain a measurement that could help arbitrate the existing tension on $H_0$, one needs to fully understand any source of systematic biases for this approach. In this study, we aim to understand the impact of instrumental calibration errors (CEs) on the measurements of the luminosity distance, $D_L$, and the inferred $H_0$ value. We simulate binary neutron star mergers (BNSs), as detected by a network of Advanced LIGO and Advanced Virgo interferometers at their design sensitivity. We artificially add CEs equal to exceptionally large values experienced in LIGO-Virgo's third observing run (O3). We find that for individual BNSs at a network signal-to-noise ratio of 50, the systematic errors on $D_L$ - and hence $H_0$ - are still smaller than the statistical uncertainties. The biases become more significant when we combine multiple events to obtain a joint posterior on $H_0$. In the rather unrealistic case that the data around each detection is affected by the same CEs corresponding to the worst offender of O3, the true $H_0$ value would be excluded from the 90% credible interval after we combine $\sim$40 sources. If instead, 10% of the sources suffer from severe CEs, the true value of $H_0$ is included in the 90% credible interval even after 100 sources.

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