论文标题
在随机重力波背景中对各向异性的模型无关搜索，并应用于Ligo-Virgo的前三个观察跑
Model-independent search for anisotropies in stochastic gravitational-wave backgrounds and application to LIGO-Virgo's first three observing Runs
论文作者
论文摘要
随机重力波（GW）背景由大量的天体物理或宇宙学起源的弱，独立和不相关的事件组成。假定天空上的GW功率在各向同性成分的顶部（即角度单极）上包含各向异性。与Ligo-virgo-kagra（LVK）搜索相辅相成，我们开发了一个有效的分析管道，以在天空像素域中使用一个sidereal Day折叠的数据来计算直接在天空像素域中的随机背景中的最大可能性各向异性天空图。我们在GW Sky的地图制作中扭转完整的像素像素相关矩阵，直到使用模拟系统地确定了最佳的本本egenmode截止。除了建模的映射外，我们还实施了一种独立的模型方法来探测随机背景的探测光谱形状。使用Ligo的数据 - Virgo的前三个观测运行，我们获得了各向异性的上限以及各向同性单极作为极限情况，与LVK结果一致。我们还使用这种新型模型独立的方法对随机背景的光谱形状进行了约束。
A stochastic gravitational-wave (GW) background consists of a large number of weak, independent and uncorrelated events of astrophysical or cosmological origin. The GW power on the sky is assumed to contain anisotropies on top of an isotropic component, i.e., the angular monopole. Complementary to the LIGO--Virgo--KAGRA (LVK) searches, we develop an efficient analysis pipeline to compute the maximum-likelihood anisotropic sky maps in stochastic backgrounds directly in the sky pixel domain using data folded over one sidereal day. We invert the full pixel-pixel correlation matrix in map-making of the GW sky, up to an optimal eigenmode cutoff decided systematically using simulations. In addition to modeled mapping, we implement a model-independent method to probe spectral shapes of stochastic backgrounds. Using data from LIGO--Virgo's first three observing runs, we obtain upper limits on anisotropies as well as the isotropic monopole as a limiting case, consistent with the LVK results. We also set constraints on the spectral shape of the stochastic background using this novel model-independent method.
