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Hu, JN; Li, A; Toki, H; Zuo, W; Hu, JN (reprint author), Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China.
Extended quark mean-field model for neutron stars
发表期刊PHYSICAL REVIEW C
语种英语
关键词Meson Coupling Model Baryon-baryon Interactions Nuclear-matter Hypernuclei Systems Densities Decay
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).
2014
ISSN0556-2813
卷号89期号:2页码:25802
学科领域Physics
DOI10.1103/PhysRevC.89.025802
收录类别SCI
项目资助者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] ; 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] ; 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] ; 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]
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/15481
专题理论物理所科研产出_SCI论文
通讯作者Hu, JN (reprint author), Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871, Peoples R China.
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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,&Hu, JN .(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.
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