Constraining hypernuclear density functional with Λ-hypernuclei and compact stars
Constraining hypernuclear density functional with Λ-hypernuclei and compact stars
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DOI：
10.1016/j.physletb.2014.06.002
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发表时间：
2014-06
影响因子：
4.4
通讯作者：
E. V. Dalen;G. Colucci;A. Sedrakian
中科院分区：
文献类型：
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作者：
E. V. Dalen;G. Colucci;A. Sedrakian
在一个基于拉格朗日的相对论密度泛函理论中，我们同时计算了重单Λ超核和含有超核的致密星，其中包括超子八重态和最轻等标量等矢量介子，这些介子通过密度相关的耦合作用耦合到重子。相应的密度泛函允许SU(6)对称性破缺和在等标量区混合，由此σ-Λ和σ-Σ耦合中偏离SU(3)对称模型所隐含的值被用来调整理论以适应实验室和天文数据。我们利用单σ-Λ超核上的数据修正了Λ耦合，并根据致密恒星最大质量的下限为2Mσ-Σ的要求导出了⊙的上界。
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⊙.