Extended quark mean-field model for neutron stars

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	Extended quark mean-field model for neutron stars
	Hu, JN ; Li, A ; Toki, H ; Zuo, W
刊名	PHYSICAL REVIEW C
	2014
卷号	89 期号:2 页码:25802
关键词	MESON COUPLING MODEL BARYON-BARYON INTERACTIONS NUCLEAR-MATTER HYPERNUCLEI SYSTEMS DENSITIES DECAY
ISSN号	0556-2813
通讯作者	Hu, JN (reprint author), Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China.
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).
学科主题	Physics
收录类别	SCI
资助信息	National Natural Science Foundation of China [11175219, 10875151, 10905048]; Major State Basic Research Developing Program of China [2007CB815004]; Knowledge Innovation Project of the Chinese Academy of Sciences [KJCX2-EW-N01]; Chinese Academy of Sciences Visiting Professorship for Senior International Scientists [2009J2-26]; China Postdoctoral Foundation [2012M520100]
原文出处	http://dx.doi.org/10.1103/PhysRevC.89.025802
语种	英语
WOS记录号	WOS:000332162100005
公开日期	2014-04-25
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15481]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Hu, JN,Li, A,Toki, H,et al. Extended quark mean-field model for neutron stars[J]. PHYSICAL REVIEW C,2014,89(2):25802.
APA	Hu, JN,Li, A,Toki, H,&Zuo, W.(2014).Extended quark mean-field model for neutron stars.PHYSICAL REVIEW C,89(2),25802.
MLA	Hu, JN,et al."Extended quark mean-field model for neutron stars".PHYSICAL REVIEW C 89.2(2014):25802.