论文标题
天体物理引力波背景的偶极子
The Dipole of the Astrophysical Gravitational-Wave Background
论文作者
论文摘要
λCDM模型的主要支柱之一是宇宙学原理，该原理指出我们的宇宙在统计学上是各向同性的，并且在大尺度上是同质的。在这里，我们使用预期将由爱因斯坦望远镜 - 宇宙探险家网络测量的天体物理引力波背景（AGWB）检验这一假设。特别是我们对AGWB偶极子执行数值计算，评估了由于聚类和观察者运动引起的运动效应而产生的内在贡献。我们基于不同频率的AGWB观察，我们在GW上下文中应用一种组件分离技术，以将运动偶极子，固有偶极子和射击噪声（SN）删除。我们展示了如何在匹配过滤中实现该技术，以最大程度地减少既说明工具噪声和SN的协方差。由于GW探测器本质上是全套的，因此我们希望这种强大的工具可以帮助测试下一年的宇宙的各向同性。
One of the main pillars of the ΛCDM model is the Cosmological Principle, which states that our Universe is statistically isotropic and homogeneous on large scales. Here we test this hypothesis using the Astrophysical Gravitational Wave Background (AGWB) expected to be measured by the Einstein Telescope-Cosmic Explorer network; in particular we perform a numerical computation of the AGWB dipole, evaluating the intrinsic contribution due to clustering and the kinematic effect induced by the observer motion. We apply a component separation technique in the GW context to disentangle the kinematic dipole, the intrinsic dipole and the shot noise (SN), based on the observation of the AGWB at different frequencies. We show how this technique can also be implemented in matched-filtering to minimize the covariance which accounts for both instrumental noise and SN. Since GW detectors are essentially full-sky, we expect that this powerful tool can help in testing the isotropy of our Universe in the next future.
