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arXiv 2003.04505hep-phnucl-th
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重离子碰撞中的涨落温度和重子化学势及有效QCD phase diagram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

Alejandro Ayala, Saul Hernandez-Ortiz, Luis A. Hernandez, Victor Knapp-Perez, Renato Zamora

摘要:

我们使用夸克的线性西格玛模型来定位有效QCD相图中的临界端点,该相图考虑了温度和夸克化学势的涨落。为此,我们使用超统计框架提供的非平衡形式主义。我们计算了高达六阶的高温和低温近似中的有效势,并纳入了环形图的贡献来解释等离子体屏蔽效应。我们固定的模型参数之间的关系的热σ和π介子的质量施加一阶相变在零温度和有限的临界值的重子化学势,我们采取的顺序的核子质量。我们发现CEP位移由于温度和/或夸克化学势的波动几乎可以忽略不计。

英文摘要:

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.

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