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arXiv 2301.04529gr-qc
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通过减少天体物理前景提高对原初随机引力波的探测灵敏度

Improving the detection sensitivity to primordial stochastic gravitational waves with reduced astrophysical foregrounds

Zhen Pan, Huan Yang

AI总结:

本文针对3G地基引力波探测器探测原初随机引力波背景时受致密双星并合前景污染的问题,提出一种减去近似信号应变并移除平均残余功率的新清理方法,使双黑洞和可探测双中子星前景残余能量密度大幅降低至探测器灵敏度极限以下,并指出亚阈值双中子星将成为下一步关键挑战。

摘要:

第三代(3G)地基引力波(GW)探测器的主要目标之一是探测来自早期宇宙过程的随机引力波背景(SGWB)。来自致密双星并合的天体物理前景将是该背景的主要污染源,必须将其高精度地削减,才能实现对原初背景的探测。在这项工作中,我们重新审视了以往研究中计算的前景削减极限,指出此前前景清理方法中可能存在的问题,并提出一种新的清理方法:减去近似信号应变并移除平均残余功率。利用该方法,在我们的模拟中,双黑洞前景的残余能量密度分数在频率 $f\in (10, 10^2)$ Hz 范围内低于 $10^{-4}$,在频率 $f\in (10^2, 10^3)$ Hz 范围内低于 $10^{-3}$,并且在所有相关频率上低于探测器灵敏度极限。对于高于探测阈值的双中子星(BNSs),清理其前景也能达到类似的精度,因此残余前景将由低于阈值的 BNSs 主导,这将是 3G 时代探测原初 SGWB 需要解决的下一个关键问题。

英文摘要:

One of the primary targets of third-generation (3G) ground-based gravitational wave (GW) detectors is detecting the stochastic GW background (SGWB) from early universe processes. The astrophysical foreground from compact binary mergers will be a major contamination to the background, which must be reduced to high precision to enable the detection of primordial background. In this work, we revisit the limit of foreground reduction computed in previous studies, point out potential problems in previous foreground cleaning methods and propose a novel cleaning method subtracting the approximate signal strain and removing the average residual power. With this method, the binary black hole foreground is reduced with fractional residual energy density below $10^{-4}$ for frequency $f\in (10, 10^2)$ Hz, below $10^{-3}$ for frequency $f\in (10^2, 10^3)$ Hz and below the detector sensitivity limit for all relevant frequencies in our simulations. Similar precision is achieved to clean the foreground from binary neutron stars (BNSs) that are above the detection threshold, so that the residual foreground is dominated by sub-threshold BNSs, which will be the next critical problem to solve for detecting the primordial SGWB in the 3G era.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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