演化不稳定性与QCD临界点
Evolutionary intermittency and the QCD critical point
摘要：
我们研究了在重离子碰撞过程中形成的临界等熵凝聚体的动力学。我们的分析是基于一个简化的模型，其中西格玛和π介子是唯一的自由度。在物理和动量空间的场描述中，我们发现冻结剖面呈现出一种结构，它揭示了σ分量中临界涨落的清晰痕迹。在粒子表示，使用蒙特卡罗模拟和阶乘矩分析，我们表明，签名的初始临界生存在检测到的π介子。我们提出了适当定义的不透明度指数的分布，纳入由于σ-π相互作用的动力学效应，作为探索重离子碰撞实验中的临界波动的基本观测。
英文摘要：
We investigate the dynamics of the critical isoscalar condensate, formed during heavy-ion collisions. Our analysis is based on a simplified model where the sigma and the pions are the only degrees of freedom. In field description, both in physical and momentum space, we find that the freeze-out profile presents a structure which reveals clear traces of the critical fluctuations in the sigma-component. In particle representation, using Monte-Carlo simulations and factorial moment analysis, we show that signatures of the initial criticality survive at the detected pions. We propose the distribution of suitably defined intermittency indices, incorporating dynamical effects due to sigma-pion interaction, as the basic observable for the exploration of critical fluctuations in heavy-ion collision experiments.
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