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arXiv 1801.09202hep-ph
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Polyakov夸克介子模型中的核子性质

Nucleon Properties in the Polyakov Quark Meson Model

Yingying Li, Jinniu Hu, Hong Mao

摘要:

在有限温度和有限密度下,利用具有两种味道的Polyakov夸克介子(PQM)模型,研究了核子作为非拓扑孤子在夸克介质和核子介质中的情况。计算了不同重子化学势下组分夸克质量随温度的变化,并根据适当的边界条件求解了运动方程。PQM模型预测在两种热环境中核子尺寸都会增加,核子质量会减少。然而,夸克和核子介质中的相结构是不同的。在夸克介质中,低密度区存在一个交叉,高密度区存在一级相变,而在核子介质中,存在一个以核子重叠为特征的交叉。

英文摘要:

We study the nucleon as a nontopological soliton in a quark medium as well as in a nucleon medium in terms of the Polyakov quark meson (PQM) model with two flavors at finite temperature and density. The constituent quark masses evolving with the temperature at various baryon chemical potentials are calculated and the equations of motion are solved according to the proper boundary conditions. The PQM model predicts an increasing size of the nucleon and a reduction of the nucleon mass in both hot environment. However, the phase structure is different from each other in quark and nucleon mediums. There is a crossover in the low-density region and a first-order phase transition in the high-density region in quark medium, whereas there exists a crossover characterized by the overlap of the nucleons in nucleon medium.

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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