关键词: 大质量中子星, 超子, 状态方程, 质量半径关系

Abstract: We calculated the mass of the neutron star by using seven parameter sets and considering the hyperon degrees of freedom in the framework of the relativistic mean field theory (RMFT), and analyzed the influence of coupling constants of hyperons on the maximum mass of neutron star. The results show that adopting three type sets （NLSH,NL3,NL2）in accordance with relative stiff equation of state (EOS), the maximum mass of neutron star can reach the mass given in the observed massive neutron star PSR J0348+0432,PSR J16142230 and the binary neutron star merger GW170817, the massive neutron star can contain hyperon phase. With the increase of the hyperon coupling constant (χ), the equation of state stiffens, and the maximum mass of neutron star increases. When χ≥0.6 of the NLSH parameter set, the maximum mass of neutron star is more than 2M⊙（M⊙ is mass of the sun）. Therefore, the massive neutron star can be obtained by choosing relative stiff EOS from three parameter sets and relative strong coupling constants of hyperons.

Key words: massive neutron star, hyperon, equation of state, massradius relationship