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arXiv 1609.02708nucl-th
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修正的夸克介子耦合模型中的超子星

Hyperon star in a modified quark meson coupling model

R. N. Mishra, H. S. Sahoo, P. K. Panda, N. Barik, T. Frederico

摘要:

采用修正的夸克-介子耦合模型(MQMC),用标量-矢量调和形式的唯象平均势表示重子内部夸克的约束相互作用,自洽地确定了含超子的核物质的物态方程.通过平均场近似,在$σ$、$ω$和$ρ$介子中引入额外的夸克耦合,实现了核物质中的强子-强子相互作用.研究了非线性$ω$-$ρ$项对物态方程的影响。超子耦合是固定的光学势值和质量半径曲线确定满足最大质量约束的$2$~M $_{\odot}$的中子星,在最近的测量中确定的脉冲星PSR J 0348 + 0432。我们还观察到,有没有引入非线性$ω$-$ρ$长期的背景下,在目前的参数化设置获得的恒星质量约束的显着优势。

英文摘要:

We determine the equation of state (EOS) of nuclear matter with the inclusion of hyperons in a self-consistent manner by using a Modified Quark Meson Coupling Model (MQMC) where the confining interaction for quarks inside a baryon is represented by a phenomenological average potential in an equally mixed scalar-vector harmonic form. The hadron-hadron interaction in nuclear matter is then realized by introducing additional quark couplings to $σ$, $ω$, and $ρ$ mesons through mean-field approximations. The effect of a nonlinear $ω$-$ρ$ term on the equation of state is studied. The hyperon couplings are fixed from the optical potential values and the mass-radius curve is determined satisfying the maximum mass constraint of $2$~M$_{\odot}$ for neutron stars, as determined in recent measurements of the pulsar PSR J0348+0432. We also observe that there is no significant advantage of introducing the nonlinear $ω$-$ρ$ term in the context of obtaining the star mass constraint in the present set of parametrizations.

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