论文标题
特殊点“火车”在混合星的M-R图中
Special point "trains" in the M-R diagram of hybrid stars
论文作者
论文摘要
我们对特殊点（SP）的可能位置进行了系统的研究，这是Mass-Radius图中混合中子星的独特特征。这项研究是在两相方法中进行的，在两阶段方法中，协变量的非局部nambu-jona-lasinio（NLNJL）模型的状态（EOS）描述了高密度（Quark物质）相，该方程被证明等于恒定速度速度（CSS）EOS。对于周围饱和密度的核物质阶段，使用了不同的相对论密度函数EOSS：DD2P00，其排除 - 体积修饰DD2P40和超核EOS EOS DD2Y-T。在目前的贡献中，我们将麦克斯韦建设方案应用于解剖过渡，并证明矢量和diquark耦合常数的同时变化导致SP“火车”的发生，而SP“火车”反对改变核物质EOS。我们建议，与恒定矢量耦合的diquark耦合的变化相对应的SP列是特殊的，因为它是最大质量线和大型混合恒星半径的下限。
We present a systematic investigation of the possible locations for the special point (SP), a unique feature of hybrid neutron stars in the mass-radius diagram. The study is performed within the two-phase approach where the high-density (quark matter) phase is described by the covariant nonlocal Nambu--Jona-Lasinio (nlNJL) model equation of state (EOS) which is shown to be equivalent to a constant-sound-speed (CSS) EOS. For the nuclear matter phase around saturation density different relativistic density functional EOSs are used: DD2p00, its excluded-volume modification DD2p40 and the hypernuclear EOS DD2Y-T. In the present contribution we apply the Maxwell construction scheme for the deconfinement transition and demonstrate that a simultaneous variation of the vector and diquark coupling constants results in the occurrence of SP "trains" which are invariant against changing the nuclear matter EOS. We propose that the SP train corresponding to a variation of the diquark coupling at constant vector coupling is special since it serves as a lower bound for the line of maximum masses and accessible radii of massive hybrid stars.
