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arXiv 2005.07216astro-ph.HEnucl-exnucl-th
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从未来大质量中子星半径测量值推断超致密丰中子物质对称性能量的贝叶斯推断

Bayesian Inference of the Symmetry Energy of Super-Dense Neutron-Rich Matter from Future Radius Measurements of Massive Neutron Stars

Wen-Jie Xie, Bao-An Li

摘要:

利用中子星核的参数化状态方程(EOS),采用贝叶斯统计方法,从三组代表各种核多体理论典型预言的假想质量-半径关联数据,即半径保持不变,在1.4 M $_{\odot}$和2.0 M $_{\odot}$之间,随着$\pm 15\%$内NS质量的增加而减少或增加。随着NS质量从1.4 M $_{\odot}$增加到2.0 M $_{\odot}$,相应的平均密度快速、缓慢或略微降低。本文以GW 170817和NICER标准中子源半径数据为参考,研究了未来的大质量中子源半径测量将如何提高我们对超密丰中子核物质的状态方程,特别是其对称能量项的认识,与人们已经从分析GW 170817和NICER数据中了解到的相比。虽然从三个数据集推断的对称核物质(SNM)的状态方程大致相同,但在$2ρ_0$以上的密度下,相应的高密度对称能有很大的不同,这表明大质量NS的半径携带了关于核对称能高密度行为的可靠信息,而SNM状态方程的其余不确定性的影响很小。

英文摘要:

Using an explicitly isospin-dependent parametric Equation of State (EOS) for the core of neutron stars (NSs) within the Bayesian statistical approach, we infer the EOS parameters of super-dense neutron-rich nuclear matter from three sets of imagined mass-radius correlation data representing typical predictions by various nuclear many-body theories, i.e, the radius stays the same, decreases or increases with increasing NS mass within $\pm 15\%$ between 1.4 M$_{\odot}$ and 2.0 M$_{\odot}$. The corresponding average density increases quickly, slowly or slightly decreases as the NS mass increases from 1.4 M$_{\odot}$ to 2.0 M$_{\odot}$. Using the posterior probability distribution functions (PDFs) of EOS parameters inferred from GW170817 and NICER radius data for canonical NSs as references, we investigate how future radius measurements of massive NS will improve our knowledge about the EOS of super-dense neutron-rich nuclear matter, especially its symmetry energy term, compared to what people have already learned from analyzing the GW170817 and NICER data. While the EOS of symmetric nuclear matter (SNM) inferred from the three data sets are approximately the same, the corresponding high-density symmetry energies at densities above about $2ρ_0$ are very different, indicating that the radii of massive NSs carry reliable information about the high-density behavior of nuclear symmetry energy with little influence from the remaining uncertainties of the SNM EOS.

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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