相对论平均场研究超子星

Investigation on the Hyperonic Star in Relativistic Mean-field Model

随着引力波探测以及对中子星质量与半径的高精度测量,中子星作为超新星爆发的剩余产物正吸引着相关领域的高度关注。在中子星的内核部分,诸如超子之类的奇异自由度有可能会出现从而形成超子星。本工作在相对论平均场模型框架下研究由核子与轻子构成的中子星以及包含超子的超子星。采用目前常用的非线性相对论平均场以及密度依赖的相对论平均场参数研究了超子对超子星质量、半径、潮汐形变等性质的影响。最后讨论了介子与超子的耦合常数对超子星性质的影响,发现当矢量介子与超子耦合系数较强时,利用现有的相对论平均场模型参数可以获得大质量的超子星。

The neutron star as a supernova remnant is attracting high attention recently due to the gravitation wave detection and precise measurements about its mass and radius.In the inner core region of the neutron star,the strangeness degrees of freedom,such as the hyperons,can be present,which is also named as a hyperonic star.In this work,the neutron star consisting of nucleons and leptons,and the hyperonic star including the hyperons will be studied in the framework of the relativistic mean-field(RMF) model.Some popular non-linear and density-dependent RMF parametrizations will be adopted to investigate the role of hyperons in a hyperonic star on its mass,radius,tidal deformability,and other properties.Finally,the coupling strengths between mesons and hyperons are also discussed,which can generate the massive hyperonic star with present RMF parameter sets,when the vector coupling constants are strong.