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arXiv 1506.05552nucl-thastro-ph.HEhep-ph
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相对论Hartree-Fock近似下含超子和夸克的中子星的物态方程

Equation of state for neutron stars with hyperons and quarks in relativistic Hartree-Fock approximation

Tsuyoshi Miyatsu, Myung-Ki Cheoun, Koichi Saito

摘要:

我们构造了明确包含超子和夸克的中子星的状态方程。利用相对论Hartree-Fock近似下的夸克-介子耦合模型,考虑奇异($σ^{\ast}$和$ϕ$)介子以及轻非奇异($σ$,$ω$,$\vecπ$和$\vecρ$)介子,导出了强子物质的EoS.确定了相关的耦合常数,重现了SU(3)味对称性下核物质和超核的实验数据。对于夸克物质,我们采用了具有单胶子交换作用的MIT袋模型,以及从强子到夸克的相变中的化学平衡的Gibbs判据。我们发现,奇异矢量($ϕ$)介子和Fock贡献使强子EoS刚性化,即使强子和夸克在核内共存,中子星的最大质量也可以与重中子星的观测质量一致.然而,在目前的计算中,在稳定的中子星中不会发生向纯夸克物质的跃迁。此外,在零温度下的夸克-强子跃迁的临界化学势的下限原来是1.5 GeV左右,以符合最近观察到的中子星数据。

英文摘要:

We construct the equation of state (EoS) for neutron stars explicitly including hyperons and quarks. Using the quark-meson coupling model with relativistic Hartree-Fock approximation, the EoS for hadronic matter is derived by taking into account the strange ($σ^{\ast}$ and $ϕ$) mesons as well as the light non-strange ($σ$, $ω$, $\vecπ$ and $\vecρ$) mesons. Relevant coupling constants are determined to reproduce the experimental data of nuclear matter and hypernuclei in SU(3) flavor symmetry. For quark matter, we employ the MIT bag model with one-gluon-exchange interaction, and Gibbs criteria for chemical equilibrium in the phase transition from hadrons to quarks. We find that the strange vector ($ϕ$) meson and the Fock contribution make the hadronic EoS stiff, and that the maximum mass of a neutron star can be consistent with the observed mass of heavy neutron stars even if the coexistence of hadrons and quarks takes place in the core. However, in the present calculation the transition to pure quark matter does not occur in stable neutron stars. Furthermore, the lower bound of the critical chemical potential of the quark-hadron transition at zero temperature turns out to be around 1.5 GeV in order to be consistent with the recent observed neutron star data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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