标题： 最大质量中子星的混合相核心的性质 显示英文标题

标题： Properties of the mixed phase core in maximum mass neutron stars

摘要： 在观测到的大质量中子星（NSs）的背景下，我们研究了内部结构、相变以及状态方程（EOS）对最大中子星的影响。我们研究了中子星内部介子-夸克相变过程中EOS的刚度变化。相对论平均场（RMF）模型和具有密度依赖性同位旋矢量耦合的RMF模型，即RMFL模型，用于描述强子物质，而为了表示夸克物质，应用了Nambu-Jona-Lasinio（NJL）模型。我们探讨了夸克物质中矢量耦合的强度，这延迟了相变开始密度并减少了最大质量，但与中子星中心密度没有明显的相关性。在最大质量中子星中可能存在一个相当大的混合相核心，但相应的混合相质量较小。 显示英文摘要

摘要： In the context of observed massive neutron stars (NSs), we examine the internal structure, phase transitions, and the impacts of the equation of state (EOS) in maximum NSs. We investigate the stiffness changes in the EOS during the hadron-quark phase transition within the NSs. The relativistic mean-field (RMF) model and RMF model with a density-dependent isovector coupling, known as the RMFL model, are used to describe hadronic matter, while to the represent quark matter, the Nambu-Jona-Lasinio (NJL) model is applied. We explore the strength of vector coupling in quark matter, which delayed the onset density and reduced the maximum mass of NS, but does not exhibit a clear correlation with the NS central density. A considerable size of the mixed phase core could exist in the maximum mass NS but with corresponding small mixed phase mass.