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arXiv 2403.19331nucl-thcond-mat.supr-conhep-ph
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用于夸克和核物质的扩展Nambu--Jona-Lasinio模型

Extended Nambu--Jona-Lasinio model for quark and nuclear matters

Gaoqing Cao

AI总结:

本研究扩展两味Nambu--Jona-Lasinio模型以自洽探索夸克和核物质,添加夸克-核子相互作用项,考虑两类“禁闭”耦合和两种夸克质量,发现零温下仅存在禁闭核物质或退禁闭夸克物质,仅特定参数下在约两倍饱和密度处有核物质到夸克物质的一级相变。

摘要:

在本工作中,我们将两味Nambu--Jona-Lasinio模型扩展为能自洽探索夸克和核物质的模型。通过添加代表夸克-核子相互作用的额外项,核子可通过类似介子的过程自动以色单态三夸克实体形式出现。除平均场近似中的夸克部分外,介子和核子均可对热力学势有贡献,从而可能产生平均场外的夸克-核物质。研究中对新相互作用项采用两类“禁闭”耦合,并考虑两种不同夸克质量以作比较。结果表明,零温下所有情况仅存在禁闭核物质或退禁闭夸克物质,完全不支持夸克-核物质;更严格地说,仅禁闭效应更强且夸克质量更小的情况,在约两倍饱和密度下存在从核物质到夸克物质的物理一级相变。

英文摘要:

In this work, we extend the two-flavor Nambu--Jona-Lasinio model to one capable of exploring quark and nuclear matter consistently. With an extra term standing for quark-nucleon interactions, nucleons could automatically emerge as color-singlet three-quark entities by following a process similar to mesons. Besides the quark part in mean field approximation, both mesons and nucleons could contribute to the thermodynamic potential thus possibly give rise to quarkyonic matter beyond mean field. In the study, two kinds of "confining" couplings are adopted for the new interaction term and two different quark masses are considered for comparison. It turns out that only confined nuclear matter or deconfined quark matter is possible for all the cases at zero temperature, thus quarkyonic matter is not favored at all. Even more strictly, only the case with stronger confinement effect and a smaller quark mass admits a physical first-order phase transition from nuclear matter to quark matter around twice saturation density.

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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