Cosmology with the lights off: Standard sirens in the Einstein Telescope era
Cosmology with the lights off: Standard sirens in the Einstein Telescope era
复制标题
DOI：
10.1103/physrevd.86.023502
复制
发表时间：
2012-04
影响因子：
5
通讯作者：
S. Taylor;J. Gair
中科院分区：
文献类型：
--
作者：
S. Taylor;J. Gair
我们利用爱因斯坦望远镜（ET）的引力波（GW）观测中子星双星，利用中子星质量函数的狭窄性，探索了约束宇宙学的前景。双中子星（DNS）双星预计将成为先进LIGO“第一束光”之后首批探测到的源之一，预计在先进时代将以每年几十颗的速度被探测到。然而，拟议的ET可以每年对数万个进行分类。将测量到的源红移分布与gw网络距离确定相结合，不仅可以精确测量背景宇宙学参数，还可以深入了解这些DNS系统的天体物理特性。特别感兴趣的将是探测dns -二进制创建和随后合并之间的延迟时间分布，以及在ET的探测范围内恒星形成率密度的演变。保持H＿0， \Omega ＿m，0{和}\Omega ＿ {\Lambda，0}不变，并研究暗能量状态方程参数恢复的精度，我们发现，使用10^5个检测到的DNS二进制，我们可以将这些参数约束到与未来CMB+BAO+SNIa测量预测约束相似的精度。此外，将合并延迟时间分布建模为幂律，将恒星形成速率（SFR）密度建模为Porciani和Madau SF2模型的参数化版本，我们发现相关的天体物理参数被限制在10以内%. All parameter precisions scaled as 1/sqrt(N), where N is the number of cataloged detections. We also investigated how precisions varied with the intrinsic underlying properties of the Universe and with the distance reach of the network (which may be affected by the low-frequency cutoff of the detector).
We explore the prospects for constraining cosmology using gravitational-wave (GW) observations of neutron-star binaries by the proposed Einstein Telescope (ET), exploiting the narrowness of the neutron-star mass function. Double neutron-star (DNS) binaries are expected to be one of the first sources detected after "first-light" of Advanced LIGO and are expected to be detected at a rate of a few tens per year in the advanced era. However the proposed ET could catalog tens of thousands per year. Combining the measured source redshift distributions with GW-network distance determinations will permit not only the precision measurement of background cosmological parameters, but will provide an insight into the astrophysical properties of these DNS systems. Of particular interest will be to probe the distribution of delay times between DNS-binary creation and subsequent merger, as well as the evolution of the star-formation rate density within ET's detection horizon. Keeping H_0, \Omega_{m,0} and \Omega_{\Lambda,0} fixed and investigating the precision with which the dark-energy equation-of-state parameters could be recovered, we found that with 10^5 detected DNS binaries we could constrain these parameters to an accuracy similar to forecasted constraints from future CMB+BAO+SNIa measurements. Furthermore, modeling the merger delay-time distribution as a power-law, and the star-formation rate (SFR) density as a parametrized version of the Porciani and Madau SF2 model, we find that the associated astrophysical parameters are constrained to within ~ 10%. All parameter precisions scaled as 1/sqrt(N), where N is the number of cataloged detections. We also investigated how precisions varied with the intrinsic underlying properties of the Universe and with the distance reach of the network (which may be affected by the low-frequency cutoff of the detector).