利用随机引力波背景爆米花信号追踪黑洞起源
Tracking the origin of black holes with the stochastic gravitational wave background popcorn signal
摘要：
在宇宙学距离上的一对黑洞合并产生的引力波（GW）的未分辨源结合成一个随机背景。这样的背景处于连续或爆米花状态，这取决于GW速率是否足够高，使得两个或更多个事件在相同频带中重叠。这两种状态分别对应于所谓的{ \it占空比}的大值和小值。我们研究了原始黑洞模型中背景的探测机制，并将其与恒星起源的黑洞产生的背景进行了比较。专注于地面探测器，我们表明，PBH起源背景的占空比大于天体物理黑洞，因为它们的质量函数和合并率的差异。我们的研究开辟了可能性，了解原始或天体物理性质的黑洞人口的随机背景的统计特性进行检查。
英文摘要：
Unresolved sources of gravitational waves (GWs) produced by the merger of a binary of black holes at cosmological distances combine into a stochastic background. Such a background is in the continuous or popcorn regime, depending on whether the GW rate is high enough so that two or more events overlap in the same frequency band. These two regimes respectively correspond to large and small values of the so-called {\it duty cycle}. We study the detection regime of the background in models of Primordial Black Holes (PBHs) and compare it to the one produced by black holes of stellar origin. Focusing on ground-based detectors, we show that the duty cycle of the PBH-origin background is larger than that of astrophysical black holes because of differences in their mass function and the merger rate. Our study opens up the possibility to learn about the primordial or astrophysical nature of black hole populations by examining the statistical properties of the stochastic background.
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