论文标题
重型离子碰撞中的温度波动和重度化学势以及有效QCD相图中临界终点的位置
Fluctuating temperature and baryon chemical potential in heavy-ion collisions and the position of the critical end point in the effective QCD phase diagram
论文作者
论文摘要
我们使用带有夸克的线性sigma模型来定位有效的QCD相图中的临界终点，以说明温度和夸克化学势的波动。为此，我们使用超级巨星框架提供的非平衡形式主义。我们计算高温和低温近似值的有效潜力，最高为第六阶，并包括环图对等离子体筛选效应的贡献。我们将模型参数固定在零温度下施加一阶相变的热西格玛和锥形质量之间的关系，并为核子质量的Baryon化学电位施加了有限的临界值。我们发现，由于温度和/或夸克化学势的波动而引起的CEP位移几乎可以忽略不计。
We use the linear sigma model with quarks to locate the critical end point in the effective QCD phase diagram accounting for fluctuations in temperature and quark chemical potential. For this purpose, we use the non-equilibrium formalism provided by the superstatistics framework. We compute the effective potential in the high- and low-temperature approximations up to sixth order and include the contribution of ring diagrams to account for plasma screening effects. We fix the model parameters from relations between the thermal sigma and pion masses imposing a first order phase transition at zero temperature and a finite critical value for the baryon chemical potential that we take of order of the nucleon mass. We find that the CEP displacement due to fluctuations in temperature and/or quark chemical potential is almost negligible.
