论文标题
混合恒星质量图及其多通信的含义的特殊点
The special point on the hybrid star mass--radius diagram and its multi--messenger implications
论文作者
论文摘要
我们显示了并研究特殊点（SP）的位置，其中混合中性星星质量 - 拉迪乌斯（M-R）曲线属于属于一类带有通用的恒定 - 速度 - 速度 - 声音（CSS）Quark Matter构建的混合状态（EOS）时，它们必须彼此交叉。我们证明，对于三参数CSS模型，SP在M-R图中的位置在很大程度上独立于HADRONES EOS的选择，但依赖于我们识别的区域的夸克物质EOS的刚度。我们发现，最大质量和SP质量之间的差异取决于脱糊化开始时的质量，因此，对于此差异，获得了0.19〜m_ \ odot $的上限，从中可以从中推导混合恒星半径的下限。加上源自一类合理软的Hadronic EOS（包括Hyperons）的辐射恒星半径的下限，我们确定了M-R图中的一个区域，该区域只能由杂化恒星占据。因此，我们建议在8.6-11.9 km范围内对大量PULSAR PSR J0740+6620进行更好的半径测量，这表明该Pulsar是内核中具有解剖夸克物质的混合中性恒星。
We show the existence and investigate the location of the special point (SP) in which hybrid neutron star mass-radius (M-R) curves have to cross each other when they belong to a class of hybrid equation of state (EoS) constructed with generic constant--speed--of--sound (CSS) quark matter models for which the onset deconfinement is varied. We demonstrate that for a three-parameter CSS model the position of the SP in the M-R diagram is largely independent of the choice of the hadronic EoS, but in dependence on the stiffness of the quark matter EoS it spans a region that we identify. We find that the difference between the maximum mass and the SP mass depends on the mass at the onset of deconfinement so that an upper limit of $0.19~M_\odot$ for this difference is obtained from which a lower limit on the radius of hybrid stars is deduced. Together with a lower limit on the radius of hadronic stars, derived from a class of reasonably soft hadronic EoS including hyperons, we identify a region in the M-R diagram which can be occupied only by hybrid stars. Accordingly, we suggest that a NICER radius measurement on the massive pulsar PSR J0740+6620 in the range of 8.6-11.9 km would indicate that this pulsar is a hybrid neutron star with deconfined quark matter in the inner core.
