新生中子星的性质与三体核力效应  

Properties of Proto-Neutron Star and Effect of Three-Body Forces

作　　者：左维[1] 李昂[2] 罗培燕[1] 雍高产[1] 

机构地区：[1]中国科学院近代物理研究所 [2]兰州大学物理科学与技术学院,兰州730000

出　　处：《高能物理与核物理》2006年第10期956-960,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10575119;10235030;101750s2);中国科学院知识创新工程重要方向性项目(KJCX2-SW-N02);国家重点基础研究发展规划(G2000077400);国家科技部重大前期研究专项基金(2002CCB00200);国家自然科学基金委创新群体项目资助~~

摘　　要：在Brueckner-Hartree-Fock理论框架内,研究了新生中子星的状态方程和性质,计算了新生中子星的最大质量和新生中子星中质子占总核子数的丰度,特别是讨论了三体核力和中微子束缚效应的影响以及三体核力和中微子束缚效应的相互影响．结果表明,无论是否考虑三体核力,中微子束缚对新生中子星的状态方程和质子丰度均有明显影响．中微子束缚导致新生中子星物质中的质子丰度显著增大．三体核力的贡献是使新生中子星的状态方程变硬并导致新生中子星中质子丰度明显增大．束缚在中子星物质中的中微子显著减弱了三体核力对于中子星物质中质子丰度的影响．Within the Brueckner-Hartree-Fock framework, the equation of state and the properties of newborn neutron stars are investigated by adopting a realistic nucleon-nucleon interaction AV18 supplemented with a microscopic three-body force or a phenomenological three-body force. The maximum mass of newborn neutron star and the proton fraction in the newborn beta-stable neutron-star matter are calculated. The neutrino-trapping and the three-body force effects are discussed, and the interplay between the effects of the trapped neutrino and the three-body force are especially explored. It is shown that neutrino trapping considerably affects the proton abundance and the equation of state of the newborn neutron star in both cases with and without the three-body forces. The effect of neutrino trapping remarkably enhances the proton abundance, and the contribution of the three-body force makes the equation of state of the newborn neutron star much stiffer at high densities and consequently increases the proton abundance strongly. The trapped neutrinos significantly reduce the influence of the three-body force on the proton abundance in newborn neutron stars.

关 键 词：新生中子星 三体核力 中微子束缚 BHF理论 

分 类 号：P145.6[天文地球—天体物理]