论文标题
用下一代重力波检测器限制双星的前景
Prospects for constraining twin stars with next-generation gravitational-wave detectors
论文作者
论文摘要
具有强相变的状态的中子恒星方程可能支持具有相同质量但潮汐变形不同的双星，混合和辐射星。在合并中子星人群中，双星的存在在二元潮汐变形和chirp质量的联合分布中产生了独特的差距。我们分析了使用下一代（XG）地面重力波检测器网络回收的模拟二进制中子恒星合并群体，以确定需要进行多少观察值来推断或排除双星的存在。使用基于简单参数双星模型的分层推理框架，我们发现一个星期的XG观测值可能足以检测到双胞胎之间的数百个潮汐变形差差，并测量双胞胎发生在几％以内的质量尺度。对于不太明显的双胞胎，XG观测将在潮汐变形性差异上放置一个严格的上限。
Neutron star equations of state with strong phase transitions may support twin stars, hybrid and hadronic stars with the same mass but different tidal deformabilities. The presence of twin stars in the population of merging neutron stars produces distinctive gaps in the joint distribution of binary tidal deformabilities and chirp masses. We analyze a simulated population of binary neutron star mergers recovered with a network of next-generation (XG) ground-based gravitational-wave detectors to determine how many observations are needed to infer, or rule out, the existence of twin stars. Using a hierarchical inference framework based on a simple parametric twin-star model, we find that a single week of XG observations may suffice to detect a tidal deformability difference of several hundred between twins and measure the mass scale at which twins occur to within a few percent. For less pronounced twins, XG observations will place a stringent upper bound on the tidal deformability difference.
