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J4 ›› 2010, Vol. 45 ›› Issue (9): 96-100.

• 物理学 • 上一篇    下一篇

自相互作用对超子星转变密度的影响

赵先锋1,张华2   

  1. 1. 滁州学院电子信息工程系, 安徽 滁州 239000;
    2. 北京应用物理与计算数学研究所, 北京 100089
  • 收稿日期:2010-01-29 出版日期:2010-09-16 发布日期:2010-10-12
  • 作者简介:赵先锋(1969-),男,博士,主要研究方向为原子核理论和粒子物理.Email:zhaopioneer.student@sina.com
  • 基金资助:

    安徽省高校省级自然科学研究项目(KJ2009B106);滁州学院科研项目(2008kj019B);滁州学院博士科研启动基金项目(2007-2013)

Effect of self-interactions on the transition density of hyperon stars

ZHAO Xian-feng1, ZHANG Hua2   

  1. 1. Department of Electronics Engineering, Chuzhou University, Chuzhou 239000, Anhui, China;
    2. Institute of Applied Physics and Computational Mathematics, Beijing100089, China
  • Received:2010-01-29 Online:2010-09-16 Published:2010-10-12

摘要:

利用相对论平均场理论,考虑重子八重态{n,p,Λ,Σ-0+-0}, 研究了自相互作用对超子星转变密度的影响。研究发现:考虑到自相互作用的贡献,超子星的转变密度增大;超子Λ,Ξ--和Ξ0出现时的重子数密度降低,而Σ0和Σ+超子出现时的重子数密度增加; 对于超子星转变密度,超子数密度贡献最大的是Λ和Ξ-超子,占总超子数密度的80%以上;自相互作用的存在使得超子Ξ-和Ξ0的贡献增大,而使Λ,Σ-0和Σ+超子的贡献减小。

关键词: 中子星;超子星;转变密度;相对论平均场理论

Abstract:

The effect of selfinteraction on the transition density of hyperon stars was examined in the framework of relativistic mean field theory for the baryon octet {n,p,Λ,Σ-0+-0}system. It was found that the transition density of hyperon stars increased compared with those without considering the contribution of self-interaction. The critical baryon density increased when the hyperons Σ0 and Σ+ appeared, but it decreased when the Λ,Ξ-,Σ- and Ξ0 appeared. For the transition density of hyperon stars, the hyperons Λ and Ξ- make a greater contribution to the hyperon number density, more than 80 percent. The presence of self-interaction makes the relative number density of Ξ-  and Ξ0 increase but that of Λ,Σ-,Σ0 and Σ+ decrease.

Key words: neutron star; hyperon star; transition density; relativistic mean field theory

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