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- W41315093 abstract "We extend the quark mean-field (QMF) model to strangeness fre edom to study the properties of hyperons (Λ, Σ, Ξ) in infinite baryonic matter and neutron star properties. Th e baryon-scalar meson couplings in 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, whi le the one for s quark is limited by the properties of nuclei with a Λ hyperon. These two strengths are not same, which represents the SU(3) symmetry breaking effectively in QMF model. With these baryon-scalar meson coupling constants, the single baryon potentials are obtained, where all of three hyperon potentials are attr active at nuclear saturation density. The potentials for Λ and Σ are difference about 5 MeV at the saturation density, which shows this SU(3) symmetry breaking approaches 20% in the extended QMF model. Finally we obtain a neutron star maximum mass of 1.59M⊙ with Λ, Σ and Ξ hyperons within the present model. This value is far from the recently measured pulsar mass, consistent with the convectional relativistic mean field theor y and also the microscopic studies based on developed realistic baryon-baryon interactions." @default.
- W41315093 created "2016-06-24" @default.
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- W41315093 date "2013-07-16" @default.
- W41315093 modified "2023-09-26" @default.
- W41315093 title "Extended quark mean-field model for neutron stars: Toward a b roken flavor SU(3) symmetry" @default.
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