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题名: Extended quark mean-field model for neutron stars
作者: Hu, JN ;  Li, A ;  Toki, H ;  Zuo, W
刊名: PHYSICAL REVIEW C
出版日期: 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
学科分类: Physics
DOI: 10.1103/PhysRevC.89.025802
通讯作者: Hu, JN (reprint author), Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China.
部门归属: [Li, A.] Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China; [Li, A.] Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China; [Hu, J. N.] Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China; [Li, A.; Zuo, W.] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China; [Toki, H.] Osaka Univ, Res Ctr Nucl Phys, Ibaraki, Osaka 5670047, Japan; [Zuo, W.] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, 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).
资助者: 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]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000332162100005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15481
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Hu, JN,Li, A,Toki, H,et al. Extended quark mean-field model for neutron stars[J]. PHYSICAL REVIEW C,2014,89(2):25802.
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