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arXiv 1801.05073astro-ph.CO
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没有红移测量的标准塞壬的宇宙学推论

Cosmological inference from standard sirens without redshift measurements

Xuheng Ding, Marek Biesiada, Xiaogang Zheng, Kai Liao, Zhengxiang Li, Zong-Hong Zhu

摘要:

本工作的目的是探讨利用未来标准的没有红移测量的海妖数据来约束宇宙学参数的前景。随着对引力波信号的成功探测,一个引力波天文学的时代已经开始。与电磁域不同,GW信号允许直接测量到源的光度距离,而它们的红移仍然需要通过识别电磁对应物来测量。这导致了几乎所有可能的BH-BH系统的重大技术问题。这是GW标准塞壬应用于宇宙学的主要障碍。在本文中,我们介绍了一般框架,单独使用光度距离的宇宙学推论。我们的想法是使用合并源的红移概率分布的先验知识,从人口综合代码评估的内在合并率。然后计算宇宙学参数的后验概率分布。我们证明了我们的方法的模拟模拟数据的性能,并表明,光度距离测量将使宇宙学参数的准确测定高达$20%$的不确定性水平。我们还发现,为了用平坦的$Λ$ CDM模型将$H_0$推断到1%的水平,我们需要大约$10^5$事件。

英文摘要:

The purpose of this work is to investigate the prospects of using the future standard siren data without redshift measurements to constrain cosmological parameters. With successful detections of gravitational wave (GW) signals an era of GW astronomy has begun. Unlike the electromagnetic domain, GW signals allow direct measurements of luminosity distances to the sources, while their redshifts remain to be measured by identifying electromagnetic counterparts. This leads to significant technical problems for almost all possible BH-BH systems. It is the major obstacle to cosmological applications of GW standard sirens. In this paper, we introduce the general framework of using luminosity distances alone for cosmological inference. The idea is to use the prior knowledge of the redshift probability distribution for coalescing sources from the intrinsic merger rates assessed with population synthesis codes. Then the posterior probability distributions for cosmological parameters can be calculated. We demonstrate the performance of our method on the simulated mock data and show that the luminosity distance measurement would enable an accurate determination of cosmological parameters up to $20%$ uncertainty level. We also find that in order to infer $H_0$ to 1% level with flat $Λ$CDM model, we need about $10^5$ events.

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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