标题： 波利亚科夫线性SU(3)σ模型：密集和热强子介质中高阶矩的特征 显示英文标题

标题： Polyakov linear SU(3) sigma model: features of higher order moments in dense and thermal hadronic medium

摘要： 为了表征粒子多重性的高阶矩，我们实施了带有Polyakov环修正的线性σ模型。 我们首先研究了临界现象并估算了某些热力学量。 然后，我们将所有这些结果与第一性原理格点QCD计算进行了比较。 随后，对非归一化的四阶矩进行了深入研究，并探讨了它们的温度和密度依赖性。 我们对归一化到温度和化学势的矩重复了这一过程。 二阶矩的涨落用于估计手征相变。 然后，我们将所有这些结果用于绘制手征相变图，该图将与从格点QCD模拟中估计的冻结参数以及热模型进行比较，并与手征相图进行对比。 显示英文摘要

摘要： In order to characterize the higher order moments of the particle multiplicity, we implement the linear-sigma model with Polyakov-loop correction. We first studied the critical phenomena and estimated some thermodynamic quantities. Then, we compared all these results with the first--principle lattice QCD calculations. Then, the extensive study of non-normalized four moments is followed by investigating their thermal and density dependence. We repeat this for moments normalized to temperature and chemical potential. The fluctuations of the second order moment is used to estimate the chiral phase--transition. Then, we implement all these in mapping out the chiral phase transition, which shall be compared with the freeze-out parameters estimated from the lattice QCD simulations and the thermal models are compared with the chiral phase--diagram.