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arXiv 2106.01765astro-ph.COgr-qc
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用DECIGO和B-DECIGO源从强透镜中约束宇宙学参数

Constraining cosmological parameters from strong lensing with DECIGO and B-DECIGO sources

Shaoqi Hou, Xi-Long Fan, Zong-Hong Zhu

摘要:

长期以来,引力透镜一直被用来测量或约束宇宙学模型。虽然LIGO/Virgo尚未观测到引力波的透镜效应,但预计未来日本星载干涉仪DECIGO和B-DECIGO如果运行4年,可以探测到几个到几百个透镜事件。在已知引力波透镜事件的情况下,我们可以通过引力波透镜统计和时间延迟方法来估计宇宙学参数的约束。利用透镜统计方法,即使有中等的不确定性,透镜红移的知识也会为物质的能量密度参数$Ω_M$设定严格的界限,即最好是$0.288\lesssimΩ_M\lesssim0.314$。对哈勃常数$H_0$的约束可以使用时间延迟方法来确定。发现在$5σ$上,DECIGO的$|δH_0|/H_0$的范围从$3\%$到$11\%$,而B-DECIGO将给出约束较少的结果,$8\%-15\%$ .在这项工作中,亮度距离和时间延迟距离的不确定度分别设置为$10\%$和$20\%$。测量这些距离的改进将收紧边界。

英文摘要:

Gravitational lensing has long been used to measure or constrain cosmology models. Although the lensing effect of gravitational waves has not been observed by LIGO/Virgo, it is expected that there can be a few to a few hundreds lensed events to be detected by the future Japanese space-borne interferometers DECIGO and B-DECIGO, if they are running for 4 years. Given the predicted lensed gravitational wave events, one can estimate the constraints on the cosmological parameters via the lensing statistics and the time delay methods. With the lensing statistics method, the knowledge of the lens redshifts, even with the moderate uncertainty, will set the tight bound on the energy density parameter $Ω_M$ for matter, that is, $0.288\lesssimΩ_M\lesssim0.314$ at best. The constraint on the Hubble constant $H_0$ can be determined using the time delay method. It is found out that at $5σ$, $|δH_0|/H_0$ ranges from $3\%$ to $11\%$ for DECIGO, and B-DECIGO will give less constrained results, $8\%-15\%$. In this work, the uncertainties on the luminosity distance and the time delay distance are set to be $10\%$ and $20\%$, respectively. The improvement on measuring these distances will tighten the bounds.

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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