Nuclear Physics A ( IF 1.7 ) Pub Date : 2021-03-17 , DOI: 10.1016/j.nuclphysa.2021.122189 Ishfaq A. Rather , A.A. Usmani , S.K. Patra
The neutron star maximum mass and the radius are investigated within the framework of the relativistic mean-field (RMF) model. The variation in the radius at the canonical mass, , using different inner crust equation of state (EoS) with different symmetry energy slope parameter is studied. It is found that although the NS maximum mass and the corresponding radius do not vary much with different inner crust EoSs, the radius and the tidal deformability at 1.4 vary with the different choice of crust EoS and variation of about 1-2 km is seen in the radius at the canonical mass. For non-unified EoSs, the crust with a low symmetry energy slope parameter produces a low NS radius at the canonical mass. The properties of maximally rotating neutron stars are also studied. The variation in the radius of rotating star at the canonical mass 1.4 is also seen with the slope parameter. Similar to the static neutron star, the radius at 1.4 of rotating neutron star is affected by slope parameter of the inner crust. Other important quantities like moment of inertia, frequency, rotational kinetic energy to gravitational energy ratio are also calculated. The variation in these quantities with the crust slope parameter is found to be more proportional to the mass and the radius of NS.
中文翻译:
内壳EoS对中子星特性的影响
在相对论平均场(RMF)模型的框架内研究了中子星的最大质量和半径。规范质量下半径的变化,,采用具有不同对称能级斜率参数的内壳状态方程(EoS)进行了研究。结果发现,尽管NS最大质量和相应的半径在不同的内壳EoSs下变化不大,但半径和潮汐变形能力为1.4随地壳EoS的不同选择而变化,并且在标准质量处的半径大约有1-2 km的变化。对于非统一的EoS,具有低对称能量斜率参数的地壳在规范质量处会产生较低的NS半径。还研究了最大旋转中子星的特性。典型质量1.4处旋转恒星半径的变化也可以通过斜率参数看到。类似于静态中子星,半径为1.4中子星的旋转受内壳倾斜参数的影响。还计算了其他重要量,例如惯性矩,频率,旋转动能与重力能之比。发现这些数量随地壳坡度参数的变化与质量和NS半径成正比。