论文标题

在深色重力波标准警报器上,作为宇宙论的推断,并预测使用Deci-Hertz天文台检测到的二进制黑洞对哈勃常数的约束

On Dark Gravitational Wave Standard Sirens as Cosmological Inference and Forecasting the Constraint on Hubble Constant using Binary Black Holes Detected by Deci-hertz Observatory

论文作者

Chen, Ju, Yan, Changshuo, Lu, Youjun, Zhao, Yuetong, Ge, Junqiang

论文摘要

来自紧凑型二元合并的引力波(GW)信号可以用作标准警报器,以限制宇宙参数,如果可以独立测量其红移。但是,恒星二元黑洞(BBH)的合并可能没有电磁对应物,因此没有直接的红移测量。这些黑暗的警笛仍然可以通过将其GW测量的光度距离和定位与周围星系的深度红移调查相结合,从而在统计上限制了宇宙学参数。我们通过使用模拟BBH和Galaxy样品详细研究了这种暗警笛。我们发现,使用准确性$ \ lyssim1 \%$可以很好地约束,如果GW观察值可以提供其亮度距离的准确估计(与$ \ lisesimsim0.01 $)和本地化($ \ limessimsim0.1.1-1-11.1-11.1-11.1-1-11-11-11-11-1-11-1-11.1-1-1-1-1-1.1-1.1-1.1-1.1-1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.2如果亮度距离和定位误差较大,则可能会显着偏见。我们还引入了一种简单的方法来纠正这种偏见,并在亮度距离和定位误差较大时发现其有效。我们进一步生成模拟的BBH样品,根据当前对BBH合并率和BBH属性的分布的限制,并发现半年观察期内的Deci-Hertz天文台(DO)可能会检测到约100个BBH,具有信号到NOISE的比率$ \ varrho $ \ varrho \ gtrsim30 $ $ \ gtrsim30 $ $ $ $ $ $ 0.02 $ \ lyssim0.01 \ rm {deg}^2 $。通过应用深标准警笛方法,我们发现使用这些do bbhs可以将哈勃常数限制在$ \ sim0.1-1 \%$级别上,这是可以在不久的将来使用电磁观测来获得的限制的准确性,因此它可能会洞悉洞察力。

Gravitational wave (GW) signals from compact binary coalescences can be used as standard sirens to constrain cosmological parameters if their redshift can be measured independently. However, mergers of stellar binary black holes (BBHs) may not have electromagnetic counterparts and thus have no direct redshift measurements. These dark sirens may be still used to statistically constrain cosmological parameters by combining their GW measured luminosity distances and localization with deep redshift surveys of galaxies around it. We investigate this dark siren method in detail by using mock BBH and galaxy samples. We find that the Hubble constant can be constrained well with an accuracy $\lesssim1\%$ with a few tens or more of BBH mergers at redshift up to $1$ if GW observations can provide accurate estimates of their luminosity distance (with relative error of $\lesssim0.01$) and localization ($\lesssim0.1~\rm{deg}^2$), though the constraint may be significantly biased if the luminosity distance and localization errors are larger. We also introduce a simple method to correct this bias and find it is valid when the luminosity distance and localization errors are modestly large. We further generate mock BBH samples, according to current constraints on BBH merger rate and the distributions of BBH properties, and find that the Deci-hertz Observatory (DO) in a half year observation period may detect about one hundred BBHs with signal-to-noise ratio $\varrho\gtrsim30$, relative luminosity distance error $\lesssim0.02$, and localization error $\lesssim0.01\rm{deg}^2$. By applying the dark standard siren method, we find that the Hubble constant can be constrained to the $\sim0.1-1\%$ level using these DO BBHs, an accuracy comparable to the constraints obtained by using electromagnetic observations in the near future, thus it may provide insight into the Hubble tension.

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