中子星物质中的K介子凝聚与三体核力效应  

Kaon Condensation in Neutron Star Matter and Nuclear Three-Body Force Effect

作　　者：左维[1,2,3,4] 李昂 陈继延 李增花[1,3] 

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 [3]中国科学院研究生院北京100049 [4]兰州重离子加速器国家实验室原子核理论中心兰州730000 [5]兰州大学物理科学与技术学院

出　　处：《高能物理与核物理》2005年第7期632-638,共7页High Energy Physics and Nuclear Physics

基　　金：中国科学院知识创新工程重要方向性项目(KJCX2SWN02);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);国家自然科学基金重点项目(10235030;10175082);国家自然科学基金委创新群体项目的资助~~

摘　　要：利用BruecknerHartreeFock方法,计算了β稳定中子星物质的状态方程以及三体核力的影响,特别是研究了三体核力对中子星物质中K介子凝聚的影响.结果表明三体核力对β稳定中子星物质中出现K介子凝聚的临界密度以及中子星物质中各种粒子所占的比例均有重要影响.三体核力的主要作用是降低了中子星物质中出现K介子凝聚的临界密度并使K凝聚相中的核物质更加接近于对称核物质.Within the framework of the Brueckner-Hartree-Fock approach, the effects of a microscopic nuclear three-body force on the critical density for kaon condensation in neutron star matter and on the composition of the kaon condensed phase have been investigated. The nuclear three-body force turns out to affect considerably both the critical density for kaon condensation and the composition of the kaon condensed phase in neutron stars via its strongly effect on the high-density behavior of nuclear symmetry energy. It is shown that inclusion of the three-body force contribution in the symmetry energy leads to a reduction of the critical density for kaon condensation and the three-body force effect on the critical density decreases as the proton strangeness content increases. The kaon condensed phase of neutron star matter turns out to be proton-rich instead of neutron-rich. The three-body force contribution results in a significant reduction of the proton and kaon fractions in the kaon condensed phase and makes the condensed neutron star matter to be more symmetric in neutrons and protons as compared with the results without including the three-body force. Our results are also compared with other theoretical predictions and discussed in connection with the possible implications for the study of neutron star structure.

关 键 词：中子星物质 K介子 三体核力效应 HARTREE-FOCK 临界密度 对称核物质 状态方程 凝聚相 粒子 

分 类 号：P145.6[天文地球—天体物理]