论文标题
去除重力波源参数中的退化和多模式
Removing degeneracy and multimodality in gravitational wave source parameters
论文作者
论文摘要
编上二进制黑洞合并用15个参数描述，其中引力波观测通常只能将$ \ sim 10 $独立组合限制为不同程度。在这项工作中，我们设计了消除相关性的坐标，并消除了量良好和测量量的量。此外，我们将后部的近似离散对称性确定为多模态的主要原因，并设计一种解决此类多模态的方法。由此产生的后期几乎没有结构，可以有效，稳健地进行采样。我们提供了用于参数估计的Python软件包，即COGWHEEL，该软件包将这些方法与其他算法一起实现了推理过程。我们引入的坐标之一是一种自旋方位角，在几个事件中都非常好。我们建议这可能是轨道进动的敏感指标，我们预计它将阐明自然界中自旋轨道错位的发生。
Quasicircular binary black hole mergers are described by 15 parameters, of which gravitational wave observations can typically constrain only $\sim 10$ independent combinations to varying degree. In this work, we devise coordinates that remove correlations, and disentangle well- and poorly-measured quantities. Additionally, we identify approximate discrete symmetries in the posterior as the primary cause of multimodality, and design a method to tackle this type of multimodality. The resulting posteriors have little structure and can be sampled efficiently and robustly. We provide a Python package for parameter estimation, cogwheel, that implements these methods together with other algorithms for accelerating the inference process. One of the coordinates we introduce is a spin azimuth that is measured remarkably well in several events. We suggest this might be a sensitive indicator of orbital precession, and we anticipate that it will shed light on the occurrence of spin-orbit misalignment in nature.
