Revisiting Stochastic Gravitational-wave Background in the Strong Signal Case
arxiv(2024)
摘要
Weak-signal limit is often used in estimating stochastic gravitational-wave
background (SGWB) intensities. This approximation fails and the signal-to-noise
ratio (SNR) can be much weaker when background signals are loud compared to the
detector noise. In this work, we highlight this limitation for the SGWB
detection using space-borne detector networks. For the TianQin + LISA network,
the SNR estimated under the weak-signal limit might be off by as large as an
order of magnitude. Contour plots of SNR over the parameter spaces are also
presented to indicate regions susceptible to this discrepancy. Our results
suggest that DA and DB type extragalactic double white dwarfs may yield an SGWB
with SNR surpassing 100 after 1 year of operation in the weak-signal-limit
scenario, with a redshift-independent merger rate of about 500
Mpc^-3 Myr^-1. In fact, this value falls significantly below the
necessary threshold. Similar influences arise for first-order phase
transitions, yet pinning down parameter regions remains formidable due to model
uncertainties.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要