On the Maximum Mass of Neutron Stars and GW190814
On the Maximum Mass of Neutron Stars and GW190814
复制标题
DOI：
10.3847/1538-4357/abd4dd
复制
发表时间：
2020-07
期刊：
影响因子：
--
通讯作者：
D. Godzieba;D. Radice;S. Bernuzzi
中科院分区：
文献类型：
--
作者：
D. Godzieba;D. Radice;S. Bernuzzi
由于最近在双星合并GW190814中发现了一个质量在2.5-2.67 M⊙之间的致密天体，我们重新审视了中子星（NSs）的最大质量问题。我们使用马尔可夫链蒙特卡罗方法生成了大约200万个有或没有一阶相变的现象学状态方程。我们固定了地壳的状态方程，只假设在较高密度下存在因果关系。我们展示了如何从即将到来的NS半径和质量观测中推断出最大NS质量的严格上界。推导出的上界只取决于相对性和因果性，因此不受核物理不确定性的影响。我们展示了中微子的最大质量下限，结合LIGO/Virgo和NICER即将进行的中微子半径测量，将如何约束致密物质的状态方程。最后，我们讨论了GW190814的含义。
Motivated by the recent discovery of a compact object with mass in the range 2.5–2.67 M ⊙ in the binary merger GW190814, we revisit the question of the maximum mass of neutron stars (NSs). We use a Markov Chain Monte Carlo approach to generate about two million phenomenological equations of state with and without first-order phase transitions. We fix the crust equation of state and only assume causality at higher densities. We show how a strict upper bound on the maximum NS mass can be inferred from upcoming observation of NS radii and masses. The derived upper bounds depend only on relativity and causality, so it is not affected by nuclear physics uncertainties. We show how a lower limit on the maximum mass of NSs, in combination with upcoming measurements of NS radii by LIGO/Virgo and NICER, would constrain the equation of state of dense matter. Finally, we discuss the implications for GW190814.