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arXiv 1811.08970hep-ph
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有限重子密度下夸克-胶子等离子体的声速、共形极限的突破和不稳定性

Speed of sound, breaking of conformal limit and instabilities in quark-gluon plasma at finite baryon density

Z. V Khaidukov, Yu. A. Simonov

摘要:

利用场相关方法(FCM)研究了在重子化学势存在下的夸克-胶子等离子体(QGP)的性质。在低密度下,考虑色磁约束和Polyakov线相互作用的QGP热力学与格点数据符合得很好,声速满足$C_s^2\leq \frac13$,但在中等密度范围内,声速表现出奇异行为,需要对Polyakov线相互作用进行密度修正以避免不稳定性。特别地,对于$μ_q >0.5$ GeV,在$(μ, T)$平面中存在$C^2_s$违反共形极限的区域。这种行为与波利雅科夫环的性质及其密度依赖性密切相关。

英文摘要:

The properties of the quark-gluon plasma(QGP) in the presence of baryon chemical potential are studied using the Field Correlator Method(FCM). At low densities the QGP thermodynamics with the colormagnetic confinement and the Polyakov line interaction is in good agreement with lattice data,and the speed of sound satisfies $C_s^2\leq \frac13$,but in the intermediate range of densities the speed of sound displays a singular behaviour and one needs density modifications of the Polyakov line interaction to avoid instabilities. In particular for $μ_q >0.5$ GeV there exists a region in the $(μ, T)$ plane where $C^2_s$ violates the conformal limit. This behaviour is strongly connected to the properties of the Polyakov loop and its density dependence.

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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