Crust-core properties of neutron stars in the Nambu-Jona-Lasinio model
Crust-core properties of neutron stars in the Nambu-Jona-Lasinio model
复制标题
Nambu-Jona-Lasinio 模型中中子星的壳核特性
DOI：
10.1088/1674-1137/42/5/054103
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发表时间：
2018
影响因子：
3.6
通讯作者：
Jiang Wei Zhou
中科院分区：
文献类型：
--
作者：
Wei Si Na;Yang Rong Yao;Jiang Wei Zhou
采用Nambu-Jona-Lasinio（NJL）模型研究了中子星壳核跃迁性质。在NJL模型中，对于给定的动量截止和饱和密度的对称能，减小对称能的斜率，壳核过渡密度和过渡压力都将增大。给定饱和密度下对称能的斜率，转捩密度和相应的转捩压力随着对称能的增加而增加。饱和密度下地壳转动惯量分数和对称能斜率之间的增加趋势表明NJL模型的动量截止值相对较大。对于500兆电子伏的动量截止，地壳的惯性矩的分数明显增加的斜率的对称能量在饱和密度。因此，在所需的地壳转动惯量分数（7%）下，动量截断为500 MeV，饱和密度对称能斜率较大的NJL模型可以给出Vela脉冲星的质量上限大于1.40
We adopt the Nambu–Jona-Lasinio (NJL) model to study the crust-core transition properties in neutron stars (NSs). For a given momentum cutoff and symmetry energy of saturation density in the NJL model, decreasing the slope of the symmetry energy gives rise to an increase in the crust-core transition density and transition pressure. Given the slope of the symmetry energy at saturation density, the transition density and corresponding transition pressure increase with increasing symmetry energy. The increasing trend between the fraction of the crustal moment of inertia and the slope of symmetry energy at saturation density indicates that a relatively large momentum cutoff of the NJL model is preferred. For a momentum cutoff of 500 MeV, the fraction of the crustal moment of inertia clearly increases with the slope of symmetry energy at saturation density. Thus, at the required fraction (7%) of the crustal moment of inertia, the NJL model with momentum cutoff of 500 MeV and a large slope of the symmetry energy of saturation density can give the upper limit of the mass of the Vela pulsar to be above 1.40