论文标题

来自二进制中子星融合的多个引力波观测的状态中性星方程的快速层次结构推断

Rapid Hierarchical Inference of Neutron Star Equation of State from multiple Gravitational Wave Observations of Binary Neutron Star Coalescences

论文作者

Ray, Anarya, Camilo, Michael, Creighton, Jolien, Ghosh, Shaon, Morisaki, Soichiro

论文摘要

贝叶斯对二进制中子星星合并的多个引力波观测的现象学参数化中子星方程(EOS)的贝叶斯分层推论对于提高我们对中子星体结构的理解,物质的一般特性和上核密度和强核力量而言至关重要。但是,这样的分析在计算上是昂贵的,因为它无法重复使用单个事件EOS不可抗拒参数估计运行,而不论生成引力波瞬态目录。由于预期在第四次观察(O4)的LIGO/处女座/Kagra的事件数量,只能预期这个问题会恶化。我们开发了一种新颖而健壮的算法,用于从重力波数据中快速和计算廉价的eoss的快速和廉价的层次化推断,该推论重新使用单个事件EOS不可知参数估计样品,以显着降低计算成本。我们有效地将中子星形物理学的先验知识作为EOS参数的贝叶斯先验。我们方法的高速和低计算成本允许每次发现新的二进制中子星事件或每当新的观察结果和理论发现改变EOS参数上的先验时,就可以有效地重新计算EOS推断。我们在真实和模拟重力波数据上测试我们的方法,以证明其准确性。我们表明,我们的计算廉价方法产生的EOS约束完全与现有的真实数据分析(用于模拟数据选择的基金会EOS)完全一致。在我们的快速分析方案中,我们还研究了具有二进制中子星特性的EOS约束的变异性,用于以不同的信噪比和质量范围绘制的模拟事件集。

Bayesian hierarchical inference of phenomenological parameterized neutron star equations of state (EoS) from multiple gravitational wave observations of binary neutron star mergers is of fundamental importance in improving our understanding of neutron star structure, the general properties of matter at supra nuclear densities and the strong nuclear force. However, such an analysis is computationally costly as it is unable to re-use single-event EoS agnostic parameter estimation runs that are carried out regardless for generating gravitational wave transient catalogs. With the number of events expected to be observable during the 4th observing run (O4) of LIGO/Virgo/KAGRA, this problem can only be expected to worsen. We develop a novel and robust algorithm for rapid and computationally cheap hierarchical inference of parameterized EoSs from gravitational wave data which re-uses single event EoS agnostic parameter estimation samples to significantly reduce computational cost. We efficiently include a priori knowledge of neutron star physics as Bayesian priors on the EoS parameters. The high speed and low computational cost of our method allow for efficient re-computation of EoS inference every time a new binary neutron star event is discovered or whenever new observations and theoretical discoveries change the prior on EoS parameters. We test our method on both real and simulated gravitational wave data to demonstrate its accuracy. We show that our computationally cheap method produces EoS constraints that are completely consistent with existing analysis for real data, the chosen fiducial EoS for simulated data. Armed with our fast analysis scheme, we also study the variability of EoS constraints with binary neutron star properties for sets of simulated events drawn in different signal-to-noise ratio and mass ranges.

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