标题： QCD状态方程的virial展开 显示英文标题

标题： QCD equation of state in a virial expansion

摘要： 我们描述了在非零温度和零化学势下，通过virial展开得到的压强、声速和相互作用量的最近三味QCD格点数据。 对于去禁闭相，我们使用了一个包含来自维度二胶子凝聚非微扰效应的唯象模型，该模型很好地再现了冻结QCD的自由能。 强子相由一个广义的共振气体模型参数化。 此外，我们将这种方法扩展到有限夸克密度，引入了相互作用的显式$\mu$-依赖性。 我们计算了压强、夸克数密度、熵和能量密度，并与格点计算的结果进行了比较。 此外，我们通过计算等压线和等熵线以及($T, \mu_q $)-平面上的临界端点来研究相图的结构。 显示英文摘要

摘要： We describe recent three-flavor QCD lattice data for the pressure, speed of soun d and interaction measure at nonzero temperature and vanishing chemical potentia l within a virial expansion. For the deconfined phase we use a phenomenological model which includes non-pert urbative effects from dimension two gluon condensates that reproduce the free en ergy of quenched QCD very well. The hadronic phase is parameterized by a generalized resonance-gas model. Furthermore, we extend this approach to finite quark densities introducing an ex plicit $\mu$-dependence of the interaction. We calculate pressure, quark-number density, entropy and energy density and compare to results of lattice calculatio ns. We, additionally, investigate the structure of the phase diagram by calculating the isobaric and isentropic lines as well as the critical endpoint in the ($T, \mu_q $)-plane.