arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.07678nucl-thhep-ph
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自洽NJL型模型下的色超导

Color superconductivity with self-consistent NJL-type model

Li-Qun Su, Chao Shi, Yong-Hui xia, Hongshi Zong

摘要:

本文用NJL型模型研究了色超导电性。NJL型模型的四费米子相互作用被Fierz变换成两个不同的类,即,夸克-反夸克和夸克-夸克相互作用通道分别与手征对称性破缺和色超导性有关。结果表明,在平均场近似下,夸克-反夸克和夸克-夸克相互作用通道的权重因子对相结构有重要影响,重子数密度对夸克-反夸克相互作用通道的权重因子有严格的约束.此外,色超导相变是二级相变,并且随着夸克数密度的增加,色超导相变发生在手征交叉相变之前。最后,我们研究了色超导的临界温度$T_c$,它与双夸克凝聚体$Δ\approx0.57T_c$的微扰结果一致。

英文摘要:

In this paper, the NJL-type model is used to investigate the color superconductivity. The four-fermion interactions of the NJL-type model are Fierz-transformed into two different classes, i.e., the quark-antiquark and the quark-quark interaction channels, associated with the chiral symmetry breaking and color superconductivity respectively. We conclude that the weighting factor between quark-antiquark and quark-quark interaction channels has significance on the phase structure when the mean-field approximation is employed, and the baryon number density gives a tight constraint on the weighting factor of quark-antiquark interaction channels. Besides, the susceptibilities show that the color superconducting phase transition is of the second-order and takes place before the chiral crossover transition as quark number density increases. In the end, we study the critical temperatures $T_c$ of the color superconductivity and it agrees with the perturbative result of diquark condensate $Δ\approx0.57T_c$.

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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