超子同位旋相互作用能对超子星转变密度的影响  

Effect of Hyperon Isospin Interaction on the Transition Density of Hyperon Stars

作　　者：赵先锋[1] 

机构地区：[1]滁州学院电子信息工程系,安徽滁州239012

出　　处：《吉林大学学报（理学版）》2011年第3期528-532,共5页Journal of Jilin University:Science Edition

基　　金：安徽省高校自然科学基金(批准号:KJ2009B106);滁州学院科学研究项目(批准号:2008kj019B);滁州学院博士科研启动基金

摘　　要：利用相对论平均场理论,考虑重子八重态{n,p,Λ,Σ-,Σ0,Σ+,Ξ-,Ξ0},研究了超子同位旋相互作用对超子星转变密度的影响.结果表明:考虑超子同位旋相互作用,当xρΣ分别取2,1,2/3时,超子星的转变密度逐渐降低;当重子数密度取为超子星转变密度时,Λ和Ξ-超子对超子星转变密度贡献最大,二者之和约占总超子数的80%;Ξ-超子的数量随xρΣ的减小而降低,Λ超子的数量分别占总超子数的34.2%,35.8%和33.8%.The effect of hyperon isospin interaction on the transition density of hyperon stars was studied by means of relativistic mean field theory for the baryon octet {n,p,Λ,Σ-,Σ0,Σ＋,Ξ-,Ξ0} system.The results show that,considering the hyperon isospin interaction,the transition density of hyperon stars gradually decreased when xρΣ=2,1,2/3.When baryonic density was the transition density of hyperon stars,the Λ and Ξ-hyperons make the most contribution to the transition density of hyperon stars,Λ and Ξ-hyperon populations nearly amount to 80% of the total hyperon populations,the particle populations of Ξ-decreased as xρΣ reduced,Λ hyperon populations were 34.2%,35.8% and 33.8% of the total hyperon populations as xρΣ=2,1,2/3,respectively.

关 键 词：中子星 超子星 转变密度 相对论平均场理论 

分 类 号：O413[理学—理论物理]