(An)isotropy measurement with gravitational wave observations
(An)isotropy measurement with gravitational wave observations
复制标题
DOI：
10.1103/physrevd.107.043016
复制
发表时间：
2022-07
影响因子：
5
通讯作者：
R. Essick;W. Farr;M. Fishbach;D. Holz;E. Katsavounidis
中科院分区：
文献类型：
--
作者：
R. Essick;W. Farr;M. Fishbach;D. Holz;E. Katsavounidis
我们使用来自LIGO-Virgo-KAGRA合作组织（LVK）第三次观测运行的GWTC-3目录来约束合并致密双星在天球中的分布。对于来自O3的63个可信检测，我们将整个天空的速率密度的相对可变性（标准差）约束为$\lesssim 16\%$，具有90％的置信度，假设速率密度的对数由相关长度为$\geq 10^\circ$的高斯随机场描述。当相关长度为$\geq 20^\circ$时，将收紧为$\lesssim 3.5\%$。虽然新的O3数据提供了迄今为止最严格的各向异性约束，但我们也没有找到支持各向同性的压倒性证据。一个简单的计数实验倾向于各向同性分布的因子$\mathcal{B}^\mathrm{iso}_\mathrm{ani} = 3.7$，尽管如此，与仅基于LVK的第一次和第二次观测运行的类似分析相比，这是一个超过两倍的改进。
We constrain the distribution of merging compact binaries across the celestial sphere using the GWTC-3 catalog from the LIGO-Virgo-KAGRA Collaborations' (LVK) third observing run. With 63 confident detections from O3, we constrain the relative variability (standard deviation) of the rate density across the sky to be $\lesssim 16\%$ at 90\% confidence assuming the logarithm of the rate density is described by a Gaussian random field with correlation length $\geq 10^\circ$. This tightens to $\lesssim 3.5\%$ when the correlation length is $\geq 20^\circ$. While the new O3 data provides the tightest constraints on anisotropies available to-date, we do not find overwhelming evidence in favor of isotropy, either. A simple counting experiment favors an isotropic distribution by a factor of $\mathcal{B}^\mathrm{iso}_\mathrm{ani} = 3.7$, which is nonetheless an improvement of more than a factor of two compared to analogous analyses based on only the first and second observing runs of the LVK.