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arXiv 2104.01524nucl-thastro-ph.HE
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手征恢复夸克星可以存在于宇宙中

The chiral restored quark stars can exist in the universe

Li-Qun Su, Yan Yan, Cheng-Ming Li, Yong-Feng Huang, Hongshi Zong

摘要:

本文在双味NJL模型框架下研究了退禁闭夸克星的物态方程,并通过引入一个结合了原拉格朗日量和Fierz变换后的拉格朗日量的参数$α$($\mathcal{L}_R= (1-α)\mathcal{L}+α\mathcal{L}_F$),采用自洽平均场近似来度量不同相互作用通道的权重.我们认为,相变的退禁闭与手性相变同时发生。因此,由于在NJL模型中缺乏对禁闭的描述,真空压力被设置为将夸克禁闭在低密度下,这是对应于手征相变临界点的压力。我们发现,退禁闭夸克星可以达到2个太阳质量以上,因此袋常数从$(130 ~\mathrm{MeV})^4$转移到$(150 ~\mathrm{MeV})^4$作为$α$的增长。此外,随着$~α$的减小,潮汐形变率$Λ$在253 ~ 482之间变化,满足1.4太阳质量中子星的$Λ<800$的天文约束.

英文摘要:

In this paper, the equation of state (EOS) of deconfined quark stars is studied in the framework of the two-flavor NJL model, and the self-consistent mean field approximation is employed by introducing a parameter $α$ combining the original Lagrangian and the Fierz-transformed Lagrangian, $\mathcal{L}_R= (1-α)\mathcal{L}+α\mathcal{L}_F$, to measure the weights of different interaction channels. It is believed that the deconfinement of phase transition happens along with the chiral phase transition. Thus, due to the lack of description of confinement in the NJL model, the vacuum pressure is set to confine quarks at low densities, which is the pressure corresponding to the critical point of chiral phase transition. We find that deconfined quark stars can reach over two-solar-mass, and the bag constant therefore shifts from $(130 ~\mathrm{MeV})^4$ to $(150 ~\mathrm{MeV})^4$ as $α$ grows. In addition, the tidal deformability $Λ$ is yielded ranging from 253 to 482 along with the decrease of $~α$, which satisfies the astronomical constraint of $Λ<800$ for 1.4-solar-mass neutron stars.

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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