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arXiv 2301.07904nucl-thastro-ph.HE
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基于有效核相互作用的中子星可观测量贝叶斯推断

Bayesian inference of neutron-star observables based on effective nuclear interactions

Jia Zhou, Jun Xu, Panagiota Papakonstantinou

AI总结:

本研究基于SHF、KIDS和RMF三种有效核相互作用模型,用贝叶斯方法约束中子星观测数据,获得核物质状态方程参数,并分析了模型依赖性。

摘要:

基于Skyrme-Hartree-Fock模型(SHF)及其扩展(Korea-IBS-Daegu-SKKU(KIDS)模型)和相对论平均场(RMF)模型,我们采用贝叶斯方法研究了来自所采用的天体物理可观测量对核物质状态方程(EOS)参数的约束。虽然中子星的质量和半径通常倾向于刚性的同位旋标量EOS和中等软度的核对称能,但观察到约束对模型的依赖性,这主要源于高阶EOS参数的纳入以及相对论与非相对论模型之间的差异。在二倍饱和密度下,对称能的值在标准SHF模型中被约束为$48^{+15}_{-11}$ MeV,在KIDS模型中被约束为$48^{+8}_{-15}$ MeV,在RMF模型中被约束为$48^{+5}_{-6}$ MeV,在68%置信区间内围绕其最大后验值。我们的研究有助于获得对核物质EOS的稳健约束,同时理解结果的模型依赖性。

英文摘要:

Based on the Skyrme-Hartree-Fock model (SHF) as well as its extension (the Korea-IBS-Daegu-SKKU (KIDS) model) and the relativistic mean-field (RMF) model, we have studied the constraints on the parameters of the nuclear matter equation of state (EOS) from adopted astrophysical observables using a Bayesian approach. While the masses and radii of neutron stars generally favors a stiff isoscalar EOS and a moderately soft nuclear symmetry energy, model dependence on the constraints is observed and mostly originates from the incorporation of higher-order EOS parameters and difference between relativistic and non-relativistic models. At twice saturation density, the value of the symmetry energy is constrained to be $48^{+15}_{-11}$ MeV in the standard SHF model, $48^{+8}_{-15}$ MeV in the KIDS model, and $48^{+5}_{-6}$ MeV in the RMF model, around their maximum {\it a posteriori} values within $68\%$ confidence intervals. Our study helps to obtain a robust constraint on nuclear matter EOS, and meanwhile, to understand the model dependence of the results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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