摘要
随着天文观测数据日益增多,通过数据驱动的方法推断中子星物质的状态方程成为一种可行的方案。本文采用贝叶斯推断和天体物理观测约束相对论平均场(Relativistic Mean Field,RMF)模型,并以此为基础,研究了核状态方程(Equation of State,EOS)和中子星结构。通过分析不同交点密度下与耦合常数密度依赖行为,发现较高的交点密度加强了天体物理观测数据对物态方程的约束,导致大质量中子星的中等密度行为变软,中心能量密度增加。特别地,我们发现包括在大质量中子星核中,声速平方超过共形极限(v_(s)^(2)>1/3)的概率很高。推断的最大中子星质量(M_(max)≥2.5 M⊙)与引力波事件(如GW190814)的解释一致,即其小质量伴星很可能对应于大质量中子星。此外,极端密度下的对称能和压强也表现出交点密度依赖性,符合多信使约束。
[Background]With the increasing number of astronomical observational data,it becomes feasible to constrain the equation of state of neutron star matter via data-driven method.[Purpose]Constrain nuclear EOSs(Equation of State)with massive neutron stars in the framework of relativistic mean field(RMF)models according to various astrophysical observations on neutron star properties.[Methods]This study investigated the nuclear EOS and neutron star structures using RMF models constrained by Bayesian inference and astrophysical observations.[Results]By analyzing density-dependent coupling constants across different critical densities,the work demonstrates that higher critical densities tighten constraints on the EOS,leading to softer intermediate-density behavior and increased central energy densities for massive neutron stars.Key findings include a high probability of the squared sound speed exceeding the conformal limit(v_(s)^(2)>1/3)in massive neutron star cores.The inferred maximum neutron star masses(M_(max)≥2.5 M⊙)align with interpretations of gravitational wave events like GW190814,where secondary components may represent massive neutron stars.The symmetry energy and pressure profiles at supranuclear densities exhibit critical-density dependence,consistent with multi-messenger constraints.[Conclusions]These findings highlight the interplay between EOS stiffness,phase transitions,and observational constraints,providing critical insights for future studies to refine nuclear matter properties through multi-messenger data and advanced density functional analyses.
作者
谢文杰
夏铖君
XIE Wenjie;XIA Chengjun(Department of Physics,Yuncheng University,Yuncheng 044000,China;Shanxi Province Intelligent Optoelectronic Sensing Application Technology,Innovation Center,Yuncheng University,Yuncheng 044000,China;Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology,Guangxi Normal University,Guilin 541004,China;Center for Gravitation and Cosmology,College of Physical Science and Technology,Yangzhou University,Yangzhou 225009,China)
出处
《核技术》
北大核心
2025年第5期64-73,共10页
Nuclear Techniques
基金
科技部平方公里阵列射电望远镜专项(No.2020SKA0120300)
国家自然科学基金(No.12275234)
山西省留学回国人员科研资助(No.20220037)
山西省基础研究计划项目(No.20210302123085)
广西重点实验室开放课题(No.NLK2023-03)
中央财政引导地方科技发展资金(No.Guike ZY22096024)资助。
关键词
相对论平均场模型
贝叶斯推断方法
中子星
状态方程
引力波
Relativity mean field model
Bayesian inference approach
Neutron stars
Equation of state
Gravitational waves
