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Broken SU(6) symmetry and massive hybrid stars
Nuclear Physics A ( IF 1.7 ) Pub Date : 2021-02-25 , DOI: 10.1016/j.nuclphysa.2021.122171
Luiz L. Lopes , Débora P. Menezes

In this work we revisit the quantum hadrodynamics (QHD) formalism to investigate hyperonic and hybrid stars with hyperon-meson couplings fixed via broken SU(6) group, in favor of a more general flavor group SU(3). We also employ an additional channel, the strangeness-hidden ϕ meson, which couples only to the hyperons. In hybrid stars, the quark phase is built with the SU(3) NJL model also with an additional vector channel in the Lagrangian. We found that within the models chosen the hyperon onset cannot be avoided by the quark-hadron phase transition, once the hyperon threshold always happens at lower density. Also, the contribution of the quark core in a hybrid star is more relevant to the radius than to the mass, and strongly depends on the quark equation of state. We are able to reproduce 2.21 M hyperonic star and 2.10 M hybrid star. Both results are in agreement with the recently detected hyper massive pulsar MSP J0740+6620.



中文翻译:

SU(6)对称性破碎和大量混合星

在这项工作中,我们重新审视了量子hadrodynamics(QHD)形式主义,以研究通过破碎的SU(6)组固定了高子介子耦合的高渗和混合星,而采用了更通用的风味组SU(3)。我们还采用了一种新的渠道陌生感隐藏φ介子,其中夫妻只对超子。在混合星中,夸克相是使用SU(3)NJL模型建立的,并且在Lagrangian中具有附加的矢量通道。我们发现,在所选模型中,一旦超子阈值始终在较低密度下发生,夸克-强子相变就无法避免超子发生。同样,混合星中夸克核的贡献与半径比与质量更相关,并且强烈取决于夸克状态方程。我们能够复制2.21中号 高音星和2.10 中号混合星。两项结果均与最近检测到的超大型脉冲星MSP J0740 + 6620一致。

更新日期:2021-02-26
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