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arXiv 0710.0653hep-lat
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高温高密度下格点量子色动力学临界点的研究

Study of the critical point in lattice QCD at high temperature and density

Shinji Ejiri

摘要:

提出了一种基于有效势随平均元格变化的研究方法,来研究有限温度和密度下格点量子色动力学的相变性质。我们分析了使用具有裸夸克质量$m/T = 0.4$的p4改进交错夸克模拟双味QCD中获得的数据,发现$μ_q/T \sim 2.5$在高密度区出现一级相变线。研究了有效势与夸克数密度的关系。由正则配分函数计算了化学势随密度的变化,并讨论了一级相变线的存在性。

英文摘要:

We propose a method to probe the nature of phase transitions in lattice QCD at finite temperature and density, which is based on the investigation of an effective potential as a function of the average plaquette. We analyze data obtained in a simulation of two-flavor QCD using p4-improved staggered quarks with bare quark mass $m/T = 0.4$, and find that a first order phase transition line appears in the high density regime for $μ_q/T \sim 2.5$. The effective potential as a function of the quark number density is also studied. We calculate the chemical potential as a function of the density from the canonical partition function and discuss the existence of the first order phase transition line.

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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