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arXiv 2002.02821hep-lat
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有限化学势下QCD交叉的格点模拟

The QCD crossover at finite chemical potential from lattice simulations

Szabolcs Borsanyi, Zoltan Fodor, Jana N. Guenther, Ruben Kara, Sandor D. Katz, Paolo Parotto, Attila Pasztor, Claudia Ratti, Kalman K. Szabo

摘要:

我们提供了迄今为止QCD跃迁线的最精确的结果。我们优化的交叉温度$T_c$的定义,允许其非常精确的测定,并从虚化学势外推到真正的$μ_B \approx 300$兆电子伏。本文中采用的$T_c$的定义是基于观察到手征磁化率作为凝聚体的函数在零和虚$μ_B$处是一个几乎通用的曲线。我们得到的参数$κ_2=0.0153(18)$和$κ_4=0.00032(67)$作为一个连续外推的基础上$N_t=10,12$和$16$晶格的夸克质量。我们还外推了手征极化率的峰值和手征跃迁的宽度。事实上,这两个都与$μ_B$的常数函数相一致。我们在探索的范围内没有看到临界的迹象。

英文摘要:

We provide the most accurate results for the QCD transition line so far. We optimize the definition of the crossover temperature $T_c$, allowing for its very precise determination, and extrapolate from imaginary chemical potential up to real $μ_B \approx 300$ MeV. The definition of $T_c$ adopted in this work is based on the observation that the chiral susceptibility as a function of the condensate is an almost universal curve at zero and imaganiary $μ_B$. We obtain the parameters $κ_2=0.0153(18)$ and $κ_4=0.00032(67)$ as a continuum extrapolation based on $N_t=10,12$ and $16$ lattices with physical quark masses. We also extrapolate the peak value of the chiral susceptibility and the width of the chiral transition along the crossover line. In fact, both of these are consistent with a constant function of $μ_B$. We see no sign of criticality in the explored range.

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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