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arXiv 2301.08074gr-qcastro-ph.CO
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随机引力波背景各向异性探测的内在极限

Intrinsic limits on the detection of the anisotropies of the Stochastic Gravitational Wave Background

Giorgio Mentasti, Carlo R. Contaldi, Marco Peloso

摘要:

对于任何给定的探测器网络,以及对于任何给定的积分时间,即使在可忽略的仪器噪声的理想化限制下,随机引力波背景(SGWB)的各向同性分量的固有时间变化也会导致SGWB中的各向异性可以被测量得多么精确的限制。我们在这里展示如何计算这个样本的限制,并将其应用到三个独立的配置放置在现有的和计划的网站地面探测器。我们的研究结果表明,在理想化的,最好的情况下,个人多极的各向异性在$\ell \leq 8$只能测量到$\sim 10^{-5} - 10^{-4}$水平超过5年的观察作为一部分的各向同性组件。由于灵敏度提高的平方根的观测时间,这构成了一个非常严重的挑战,测量的各向异性SGWB的宇宙起源,即使在理想化的探测器的情况下,任意低仪器噪声。

英文摘要:

For any given network of detectors, and for any given integration time, even in the idealized limit of negligible instrumental noise, the intrinsic time variation of the isotropic component of the Stochastic Gravitational Wave Background (SGWB) induces a limit on how accurately the anisotropies in the SGWB can be measured. We show here how this sample limit can be calculated and apply this to three separate configurations of ground-based detectors placed at existing and planned sites. Our results show that in the idealized, best-case scenario individual multipoles of the anisotropies at $\ell \leq 8$ can only be measured to $\sim 10^{-5} - 10^{-4}$ level over 5 years of observation as a fraction of the isotropic component. As the sensitivity improves as the square root of the observation time, this poses a very serious challenge for the measurement of the anisotropies of SGWB of cosmological origin, even in the case of idealised detectors with arbitrarily low instrumental noise.

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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