Extended quark mean-field model for neutron stars

doi:10.1103/PhysRevC.89.025802

	Extended quark mean-field model for neutron stars
	Hu, J. N.3; Li, A.1,2,4; Toki, H.5; Zuo, W.4,6
刊名	PHYSICAL REVIEW C
	2014-02-05
卷号	89
ISSN号	0556-2813
DOI	10.1103/PhysRevC.89.025802
文献子类	Article
英文摘要	We extend the quark mean-field (QMF) model to strangeness freedom to study the properties of hyperons (Lambda, Sigma, Xi) in infinite baryon matter and neutron star properties. The baryon-scalar meson couplings in the QMF model are determined self-consistently from the quark level, where the quark confinement is taken into account in terms of a scalar-vector harmonic oscillator potential. The strength of such confinement potential for u, d quarks is constrained by the properties of finite nuclei, while that for an s quark is limited by the properties of nuclei with a Lambda hyperon. These two strengths are not the same, which represents the SU(3) symmetry breaking effectively in the QMF model. Also, we use an enhanced Sigma coupling with the vector meson, and both Sigma and Xi hyperon potentials can be properly described in the model. The effects of the SU(3) symmetry breaking on the neutron star structures are then studied. We find that the SU(3) breaking shifts the hyperon onset density earlier and makes hyperons more abundant in the star, in comparison with the results of the SU(3) symmetry case. However, it has little effect on the star's maximum mass. The maximum masses are found to be 1.62M(circle dot) with hyperons and 1.88M(circle dot) without hyperons. The present neutron star model is shown to have limitations in explaining the recently measured heavy pulsars around 2M(circle dot).
资助项目	China Postdoctoral Foundation[2012M520100]
WOS关键词	MESON COUPLING MODEL ; BARYON-BARYON INTERACTIONS ; NUCLEAR-MATTER ; HYPERNUCLEI ; SYSTEMS ; DENSITIES ; DECAY
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000332162100005
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/49163]
专题	中国科学院近代物理研究所
通讯作者	Hu, J. N.
作者单位	1.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 2.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China 3.Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China 4.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China 5.Osaka Univ, Res Ctr Nucl Phys, Ibaraki, Osaka 5670047, Japan 6.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Hu, J. N.,Li, A.,Toki, H.,et al. Extended quark mean-field model for neutron stars[J]. PHYSICAL REVIEW C,2014,89.
APA	Hu, J. N.,Li, A.,Toki, H.,&Zuo, W..(2014).Extended quark mean-field model for neutron stars.PHYSICAL REVIEW C,89.
MLA	Hu, J. N.,et al."Extended quark mean-field model for neutron stars".PHYSICAL REVIEW C 89(2014).