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arXiv 1406.0744nucl-thastro-ph.SR
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用$Λ$ -超核和致密星约束超核密度泛函

Constraining hypernuclear density functional with $Λ$-hypernuclei and compact stars

E. N. E. van Dalen, Giuseppe Colucci, Armen Sedrakian

摘要:

在相对论性密度泛函理论的基础上,采用拉格朗日量,同时计算了重单$Λ$超核和含有超核核的致密星,该方法包括超子八重态和最轻的等标等矢量介子,它们与重子的耦合依赖于密度.相应的密度泛函允许SU(6)对称性破缺和在等辐射扇区的混合,因此$σ$ - $Λ$和$σ$ - $Σ$耦合偏离SU(3)对称模型所暗示的值,用于调整理论以适应实验室和天文数据。我们利用单$Λ$超核的数据修正了$σ$ - $Λ$耦合,并从致密星最大质量的下限为$2 M_{\odot}$的要求出发,导出了$σ$-$Σ$耦合的上限.

英文摘要:

We present a simultaneous calculation of heavy single-$Λ$ hypernuclei and compact stars containing hypernuclear core within a relativistic density functional theory based on a Lagrangian which includes the hyperon octet and lightest isoscalar-isovector mesons which couple to baryons with density-dependent couplings. The corresponding density functional allows for SU(6) symmetry breaking and mixing in the isoscalar sector, whereby the departures in the $σ$-$Λ$ and $σ$-$Σ$ couplings away from their values implied by the SU(3) symmetric model are used to adjust the theory to the laboratory and astronomical data. We fix $σ$-$Λ$ coupling using the data on the single-$Λ$ hypernuclei and derive an upper bound on the $σ$-$Σ$ from the requirement that the lower bound on the maximum mass of a compact star is $2 M_{\odot}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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