arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.14570gr-qcastro-ph.IMphysics.data-an
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用脉冲星定时阵列进行各向异性引力波背景搜索的Fisher形式

Fisher formalism for anisotropic gravitational-wave background searches with pulsar timing arrays

Yacine Ali-Haïmoud, Tristan L. Smith, Chiara M. F. Mingarelli

摘要:

脉冲星计时阵列(PTA)是目前唯一直接对周期长达十年的引力波敏感的实验。在未来的五到十年内,PTA有望探测到由吸入的超大质量黑洞双星共同产生的随机引力波背景(SGWB)。预计这一背景主要是各向同性的,目前的搜索集中在SGWB的反射部分。展望未来,SGWB中的各向异性可能会提供关于已知和未知天体物理学和宇宙学来源的额外信息。在本文中,我们建立了一个简单而现实的Fisher形式主义各向异性SGWB搜索与PTA。我们的形式主义是能够适应现实的PTA属性,并允许简单而准确的预测。我们说明了我们的方法与理想化的PTA组成的相同的,各向同性分布的heteroars。在一篇配套论文中,我们将我们的形式主义应用于当前的PTA,并表明它可以成为指导和优化真实数据分析的强大工具。

英文摘要:

Pulsar timing arrays (PTAs) are currently the only experiments directly sensitive to gravitational waves with decade-long periods. Within the next five to ten years, PTAs are expected to detect the stochastic gravitational-wave background (SGWB) collectively sourced by inspiralling supermassive black hole binaries. It is expected that this background is mostly isotropic, and current searches focus on the monopole part of the SGWB. Looking ahead, anisotropies in the SGWB may provide a trove of additional information both on known and unknown astrophysical and cosmological sources. In this paper, we build a simple yet realistic Fisher formalism for anisotropic SGWB searches with PTAs. Our formalism is able to accommodate realistic properties of PTAs, and allows simple and accurate forecasts. We illustrate our approach with an idealized PTA consisting of identical, isotropically distributed pulsars. In a companion paper, we apply our formalism to current PTAs and show that it can be a powerful tool to guide and optimize real data analysis.

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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