论文标题
逐个事件的当地事件保护定律在特定性的超相关重离子碰撞中的影响
Effects of local event-by-event conservation laws in ultra-relativistic heavy ion collisions at the particlization
论文作者
论文摘要
相对论重离子碰撞的许多模拟都涉及从相对论流体动力学转向动力学粒子传输。这种切换需要从流体动力学提供的能量，动量和保守电流的分布中对颗粒进行采样。通常，此采样仅确保平均水平的保存，即保守量实际上可能在采样的粒子构型之间波动，并且仅在许多此类构型上的平均值与它们的水力动力学值一致。在这里，我们采用了最近发明的方法[Oliinychenko，Koch; PRL 123，18，182302（2019）]，以确保在空间紧凑区域（斑块）中为每种采样配置的保护定律（斑块）和研究其效果：从众所周知的（微）规范抑制平均值和方差到少量研究（微型）规范相关性和较高级别的级别波动。这些效果大多数对斑块大小敏感。当贴片大小输入无限时，它们中的许多人即使在热力学极限中也不会消失。开发的方法对于参与随机流体动力学的参与至关重要。它对于研究手性磁效应，小型系统和通常的波动和相关性可观察物很有用。
Many simulations of relativistic heavy ion collisions involve the switching from relativistic hydrodynamics to kinetic particle transport. This switching entails the sampling of particles from the distribution of energy, momentum and conserved currents provided by hydrodynamics. Usually this sampling ensures the conservation of these quantities only on the average, i.e. the conserved quantities may actually fluctuate among the sampled particle configurations and only their averages over many such configurations agree with their values from hydrodynamics. Here we apply a recently invented method [Oliinychenko, Koch; PRL 123, 18, 182302 (2019)] to ensure conservation laws for each sampled configuration in spatially compact regions (patches) and study their effects: from the well-known (micro-)canonical suppression of means and variances to little studied (micro-)canonical correlations and higher order fluctuations. Most of these effects are sensitive to the patch size. Many of them do not disappear even in the thermodynamic limit, when the patch size goes to infinity. The developed method is essential for particlization of stochastic hydrodynamics. It is useful for studying the chiral magnetic effect, small systems, and in general for fluctuation and correlation observables.
