The QCD phase diagram in the limit of heavy quarks using complex Langevin dynamics
The QCD phase diagram in the limit of heavy quarks using complex Langevin dynamics
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DOI：
10.1007/jhep09(2016)087
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发表时间：
2016-06
影响因子：
5.4
通讯作者：
G. Aarts;Felipe Attanasio;B. Jäger;D. Sexty
中科院分区：
文献类型：
--
作者：
G. Aarts;Felipe Attanasio;B. Jäger;D. Sexty
复杂朗之万模拟允许对表现出符号问题的理论进行数值研究，例如QCD，因此可能适合从第一原理确定QCD相图。本文研究了在大范围温度和化学势下重夸克极限下的QCD。我们的结果包括对自适应规范冷却技术的分析，该技术可以防止在SL（3,）歧管的非紧凑方向上发生大的偏移。我们发现这种漂移可能会自发出现，并改变物理观测值的统计分布，从而导致与已知结果的不一致。其偏移量足够小的结果被用来绘制受限和限定夸克相之间的边界线。
Complex Langevin simulations allow numerical studies of theories that exhibit a sign problem, such as QCD, and are thereby potentially suitable to determine the QCD phase diagram from first principles. Here we study QCD in the limit of heavy quarks for a wide range of temperatures and chemical potentials. Our results include an analysis of the adaptive gauge cooling technique, which prevents large excursions into the non-compact directions of the SL (3,) manifold. We find that such excursions may appear spontaneously and change the statistical distribution of physical observables, which leads to disagreement with known results. Results whose excursions are sufficiently small are used to map the boundary line between confined and deconfined quark phases.