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arXiv 1507.04527hep-lathep-phnucl-th
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强耦合格点量子色动力学中有限密度手征相变的重子数净涨落

Net baryon number fluctuations across the chiral phase transition at finite density in the strong coupling lattice QCD

Terukazu Ichihara, Kenji Morita, Akira Ohnishi

摘要:

在强耦合和手征极限下,研究了有限密度下手征相变中的重子数涨落。用辅助场蒙特卡罗方法考虑了介子场的涨落。发现高阶累积量比$Sσ$和$κσ^2$在$μ/T\gtrsim 0.2$处的相边界附近有振荡行为,并且存在高阶累积量比为负的区域.发现$κσ^2$的负区域随着晶格尺寸的增大而缩小。这一行为符合缩放分析的预期。

英文摘要:

We investigate the net-baryon number fluctuations across the chiral phase transition at finite density in the strong coupling and chiral limit. Mesonic field fluctuations are taken into account by using the auxiliary field Monte-Carlo method. We find that the higher-order cumulant ratios, $Sσ$ and $κσ^2$, show oscillatory behavior around the phase boundary at $μ/T\gtrsim 0.2$, and there exists the region where the higher-order cumulant ratios are negative. The negative region of $κσ^2$ is found to shrink with increasing lattice size. This behavior agrees with the expectations from the scaling analysis.

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