超子耦合常数对混合星性质的影响

用相对论平均场理论描述强子物质, 用NJL模型描述夸克物质研究了超子耦合常数对混合星性质的影响. 结果表明, 随着超子耦合常数的增大, 强子-夸克相变密度变小, 混合相区域的状态方程变硬, 中子星的最大质量及对应的半径变大. 超子耦合常数由0.73增到1.0时, 混合星最大质量由1.68M_⊙增至1.84M_⊙, 相应的半径由11.4km变到12.5km. 该夸克模型下不同强子参数组对应的混合星性质也有较明显的差异. 可知, 其适合于描述大质量而小夸克核心的混合星.

Influence of Hyperon Coupling Constant on the Properties of Hybrid Stars

In terms of the relativistic mean field theory, which describes the hadronic matter, and the NJL model, which characterizes the quark matter, the influence of hyperon coupling constant on the properties of hybrid stars is studied. The numerical results show that with the increase of the hyperon coupling constant the phase transition density decreases, the equation of state in the mixed phase range stiffens, and the maximum mass and the corresponding radius increase. When the hyperon coupling constant increases from 0.73 to 1, the maximum mass of the star increases from 1.68M to 1.82M and the corresponding radius of the star changes from 11.4km to 12.5km. The result also shows that the different hadronic equations of state have different influence on the properties hybrid stars. This model is suitable for describing the hybrid stars with big masses and small quark cores.