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arXiv 1907.09461hep-lathep-ph
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静态夸克自由能对$μ_B$和$N_f = 2+1$ QCD交叉温度的依赖性

Dependence of the static quark free energy on $μ_B$ and the crossover temperature of $N_f = 2+1$ QCD

Massimo D'Elia, Francesco Negro, Andrea Rucci, Francesco Sanfilippo

摘要:

在120~MeV到1~GeV的温度范围内,采用两种不同的欧氏时间延拓值$N_t = 6$和$N_t = 8$,采用交错离散,研究了具有物理夸克质量的$N_f = 2+1$ QCD的静态夸克自由能对重子化学势的依赖关系.为了处理符号问题,我们利用泰勒展开和解析延拓,得到一致的结果。我们表明,$μ_B$上的自由能的依赖性是敏感的手性交叉的位置,特别是$μ_B$的敏感性,即在$μ_B^2$中的自由能的泰勒展开的线性项,具有约150兆电子伏的峰值。我们还讨论了基于微扰理论的高温区的预期行为,并获得了良好的定量协议与数值计算结果。

英文摘要:

We study the dependence of the static quark free energy on the baryon chemical potential for $N_f = 2+1$ QCD with physical quark masses, in a range of temperature spanning from 120~MeV up to 1~GeV and adopting a stout staggered discretization with two different values of the Euclidean temporal extension, $N_t = 6$ and $N_t = 8$. In order to deal with the sign problem, we exploit both Taylor expansion and analytic continuation, obtaining consistent results. We show that the dependence of the free energy on $μ_B$ is sensitive to the location of the chiral crossover, in particular the $μ_B$-susceptibility, i.e. the linear term in $μ_B^2$ in the Taylor expansion of the free energy, has a peak around 150 MeV. We also discuss the behavior expected in the high temperature regime based on perturbation theory, and obtain a good quantitative agreement with numerical results.

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