Stochastic gravitational-wave backgrounds can be of either cosmological or astrophysical origin. The detection of an astrophysical stochastic gravitational-wave background with ground-based interferometers is expected in the near future. Perhaps even more excitingly, the detection of stochastic backgrounds of cosmological origin by future ground-based interferometers could reveal invaluable information about the early Universe. From this perspective, the astrophysical background is a foreground that can prevent the extraction of this information from the data. In this paper, we revisit a time-frequency domain notching procedure previously proposed to remove the astrophysical foreground in the context of next-generation ground-based detectors, but we consider the more realistic scenario where we remove individually detectable signals by taking into account the uncertainty in the estimation of their parameters. We find that time-frequency domain masks can still efficiently remove the astrophysical foreground and suppress it to about 5% of its original level. Further removal of the foreground formed by unresolvable events (in particular, unresolvable binary neutron stars), which is about 10 times larger than the residual foreground from realistic notching, would require detector sensitivity improvements. Therefore, the main limitation in the search for a cosmological background is the unresolvable foreground itself, and not the residual of the notching procedure.

中文翻译：

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通过使用下一代引力波探测器切出可解析的紧凑双星前景来搜索宇宙学随机背景


随机引力波背景可以源自宇宙学或天体物理学。预计在不久的将来可以用地面干涉仪探测天体物理随机引力波背景。也许更令人兴奋的是，未来的地面干涉仪对宇宙起源的随机背景的探测可以揭示有关早期宇宙的宝贵信息。从这个角度来看，天体物理背景是可以阻止从数据中提取此信息的前景。在本文中，我们重新审视了先前提出的时频域陷波程序，以在下一代地面探测器的背景下消除天体物理前景，但我们考虑更现实的场景，即通过考虑以下因素来消除单独的可检测信号：其参数估计的不确定性。我们发现时频域掩模仍然可以有效地去除天体物理前景并将其抑制到原始水平的 5% 左右。进一步去除由无法解析的事件（特别是无法解析的双中子星）形成的前景（该前景比实际切口中的残留前景大大约 10 倍）将需要提高探测器的灵敏度。因此，寻找宇宙学背景的主要限制是无法解析的前景本身，而不是切口过程的残留。