标题： QCD在有限温度下的手征相边界 显示英文标题

标题： Chiral phase boundary of QCD at finite temperature

摘要： 我们分析了在有限温度下QCD中手征对称性破缺的方法，使用了功能重整化群方法。 我们在简单的截断重整化流中计算了QCD在所有温度和尺度下的运行规范耦合。 在有限温度下，耦合由对应温度以下尺度的三维理论的固定点控制。 如果运行耦合使夸克部分达到临界性，则接近手征对称性破缺。 我们定量地确定了温度和味数平面中的相变边界，并发现与格点结果有良好一致性。 作为一个普遍且可检验的预测，我们观察到我们的基本红外固定点情景在临界味数附近的相变边界形状上留下了印记：在此处，临界温度的标度由运行耦合的零温度红外临界指数决定。 显示英文摘要

摘要： We analyze the approach to chiral symmetry breaking in QCD at finite temperature, using the functional renormalization group. We compute the running gauge coupling in QCD for all temperatures and scales within a simple truncated renormalization flow. At finite temperature, the coupling is governed by a fixed point of the 3-dimensional theory for scales smaller than the corresponding temperature. Chiral symmetry breaking is approached if the running coupling drives the quark sector to criticality. We quantitatively determine the phase boundary in the plane of temperature and number of flavors and find good agreement with lattice results. As a generic and testable prediction, we observe that our underlying IR fixed-point scenario leaves its imprint in the shape of the phase boundary near the critical flavor number: here, the scaling of the critical temperature is determined by the zero-temperature IR critical exponent of the running coupling.