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首页> 外文期刊>Physical review, C >Dynamical net-proton fluctuations near a QCD critical point
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Dynamical net-proton fluctuations near a QCD critical point

机译：QCD关键点附近的动态净质子波动

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摘要

We investigate the evolution of the net-proton kurtosis and the kurtosis of the chiral order parameter near the critical point in the model of nonequilibrium chiral fluid dynamics. The order parameter is propagated explicitly and coupled to an expanding fluid of quarks and gluons in order to describe the dynamical situation in a heavy-ion collision. We study the critical region near the critical point on the crossover side. There are two sources of fluctuations: noncritical initial event-by-event fluctuations and critical fluctuations. These fluctuations can be distinguished by comparing a mean-field evolution of averaged thermodynamic quantities with the inclusion of fluctuations at the phase transition. We find that while the initial state fluctuations give rise to flat deviations from statistical fluctuations, critical fluctuations reveal a clear structure of the phase transition. The signals of the critical point in the net-proton and sigma-field kurtosis are affected by the nonequilibrium dynamics and the inhomogeneity of the space-time evolution but they develop clearly.
机译：我们研究了Net-Proton Kurtosis的演变和手性秩序参数的峰值，靠近非Quiribium手性流体动力学模型的关键点。顺序参数明确地传播并耦合到夸克和泡沫的扩展流体，以便描述重离子碰撞中的动态情况。我们研究了交叉侧临界点附近的临界区域。有两个波动来源：非批判性初始事件波动和临界波动。通过比较平均热力学量的平均场演变，可以在相位过渡处的波动的比较来区分这些波动。我们发现，虽然初始状态波动导致与统计波动的扁平偏差，临界波动揭示了相转型的明显结构。净质子和Sigma-Field Kurtosis中临界点的信号受到不合格动态的影响和时空进化的不均匀性，但它们显然发展。

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