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arXiv 1903.01280nucl-thastro-ph.HEastro-ph.SRnucl-ex
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用GW170817理论讨论中子星状态方程

Note on neutron star equation of state in the light of GW170817

Ang Li, Zhen-Yu Zhu

摘要:

从GW170817的第一个多信使事件开始,我们就可以得到两颗恒星的潮汐形变的清晰鲁棒约束,这为我们研究致密恒星物质的状态方程提供了独特的机会。在这篇文章中,我们采用了一个模型,从夸克水平,描述一致的核子和多体核子系统的夸克势。我们检查,我们的EOS集是一致的,在亚核饱和密度和更高的密度与现有的实验和观测约束。与从头计算的一致性也很好。特别是,我们调整的对称性能量的密度依赖性(其斜率在核饱和$L$),并研究其对潮汐变形的影响。所谓的$QMF18$ EOS是以$L=40~\rm MeV$的例子命名的,它给出了$M_{\rm TOV} =2.08~M_\odot$和$R= 11.77~\rm km$,$Λ=331$用于$1.4\,M_\odot$星。潮汐信号被证明是不敏感的不确定的壳核匹配,尽管对称能量斜率和恒星半径之间的良好的相关性。

英文摘要:

From the very first multimessenger event of GW170817, clean robust constraints can be obtained for the tidal deformabilities of the two stars involved in the merger, which provides us unique opportunity to study the equation of states (EOSs) of dense stellar matter. In this contribution, we employ a model from the quark level, describing consistently a nucleon and many-body nucleonic system from a quark potential. We check that our sets of EOSs are consistent with available experimental and observational constraints at both sub-nuclear saturation densities and higher densities. The agreements with ab-initio calculations are also good. Especially, we tune the density dependence of the symmetry energy (characterized by its slope at nuclear saturation $L$) and study its influence on the tidal deformability. The so-called $QMF18$ EOS is named after the case of $L=40~\rm MeV$, and it gives $M_{\rm TOV} =2.08~M_\odot$ and $R= 11.77~\rm km$, $Λ=331$ for a $1.4\,M_\odot$ star. The tidal signals are demonstrated to be insensitive to the uncertain crust-core matching, despite the good correlation between the symmetry energy slope and the radius of the star.

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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