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arXiv 2406.03211nucl-thhep-ph
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具有非奇异夸克物质核心的混合星研究

Study of hybrid stars with nonstrange quark matter cores

Cheng-Ming Li, He-Rui Zheng, Shu-Yu Zuo, Ya-Peng Zhao, Fei Wang, Yong-Feng Huang

AI总结:

本文在两味 NJL 模型中引入密度相关耦合修正,结合格点 QCD 约束与中子星观测,研究非奇异夸克核心混合星,并推断 GW170817 双中子星应为强子星。

摘要:

在本工作中,基于夸克物质可能并非奇异物质的假设(Holdom 等人,2018),我们在两味 Nambu-Jona-Lasinio(NJL)模型中采用四夸克标量相互作用耦合常数的修正形式 $G\rightarrow G_1+G_2\langle\barψψ\rangle$,以研究非奇异混合星,其中 $G_1$ 和 $G_2$ 是利用临界温度、零化学势条件下的格点 QCD 模拟结果加以约束的两个参数。Maxwell 构造被用于描述混合星中的一阶禁闭–退禁闭相变。借助近期关于中子星质量、半径和潮汐形变度的测量结果,混合态物态方程受到约束。研究发现,纯非奇异夸克物质核心可以存在于混合星中,其质量为 $0.026-0.04$ 倍太阳质量。在修正 NJL 模型框架下,混合星的最大质量比传统两味 NJL 模型所得结果轻约 $0.1$ 倍太阳质量。本文论证认为,GW170817 中的双中子星应当是强子星。

英文摘要:

In this work, under the hypothesis that quark matter may not be strange (Holdom et al. 2018), we adopt a modification of the coupling constant of the four-quark scalar interaction $G\rightarrow G_1+G_2\langle\barψψ\rangle$ in the 2-flavor Nambu-Jona-Lasinio (NJL) model to study nonstrange hybrid stars, where $G_1$ and $G_2$ are two parameters constrained by using the lattice QCD simulation results at the critical temperature and zero chemical potential. The Maxwell construction is used to describe the first-order confinement-deconfinement phase transition in hybrid stars. With recent measurements on neutron star mass, radius, and tidal deformability, the hybrid equation of states are constrained. It is found that pure nonstrange quark matter cores can exist in hybrid stars, possessing $0.026-0.04$ solar mass. The maximum hybrid star mass in the framework of the modified NJL model is about 0.1 solar mass lighter than that in the conventional 2-flavor NJL model. It is argued that the binary neutron stars in GW170817 should be hadron 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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