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arXiv 1601.04839hep-ph
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QCD临界点附近的动态净质子涨落

Dynamical net-proton fluctuations near a QCD critical point

Christoph Herold, Marlene Nahrgang, Yupeng Yan, Chinorat Kobdaj

摘要:

本文研究了非平衡手征流体动力学模型中临界点附近净质子峰态和手征序参量峰态的演化。为了描述重离子碰撞中的动力学情况,序参量被显式传播并耦合到夸克和胶子的膨胀流体中。我们研究了交叉侧临界点附近的临界区域。波动有两种来源:非临界初始逐事件波动和临界波动。这些波动可以区分通过比较平均场演化的平均热力学量与包含在相变的波动。我们发现,虽然初始状态的波动引起的统计波动,临界波动揭示了一个明确的结构的相变的平坦偏差。净质子临界点和σ场峰态信号受非平衡动力学和时空演化不均匀性的影响,但发展明显。

英文摘要:

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: non-critical 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 develop clearly.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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