论文标题
扩展系统中关键的净 - 巴里昂波动
Critical net-baryon fluctuations in an expanding system
论文作者
论文摘要
在这项工作中，我们研究了纵向Bjorken膨胀的后果以及在净 - 巴里元密度中波动扩散动力学的1+1D非线性模型上的类似哈勃样温度冷却方案。波动的平衡行为在临界点所假定位置的附近的敏感性的温度依赖性中完全编码，并且在消失了与晶格QCD计算的串联串联的串联内部。我们证明了波动可观察到在动力学上的敏感性，特别是在扩散长度和冻结条件上。尽管临界信号是可见的，并且临界区域通过扩展扩大，但太小的扩散长度可以强烈降低信号的幅度。我们建议在实验中搜索中间速度上的重子的显着抗相关性，并绘制出四阶累积剂的速度依赖性，在存在临界点（仅在其存在下）的情况下，在中间速度的临界点具有明显的最小值。
In this work we study the consequences of a longitudinal Bjorken expansion and a Hubble-like temperature cooling scenario on a 1+1D non-linear model of the diffusive dynamics of fluctuations in the net-baryon density. The equilibrium behavior of the fluctuations is fully encoded in the temperature dependence of the susceptibilities on the crossover side both in the vicinity of the assumed location of the critical point and at vanishing baryo-chemical potential in-line with lattice QCD calculations. We demonstrate the great sensitivity of the fluctuation observables on the dynamics, in particular on the diffusion length and the freeze-out conditions. While the critical signals are visible and the critical region is broadened by the expansion, a too small diffusion length can strongly reduce the amplitude of the signals. We propose to search for significant anti-correlations of baryons at intermediate rapidity experimentally and to map out the rapidity dependence of the fourth-order cumulant, which in the presence of a critical point (and only in its presence) has a pronounced minimum at intermediate rapidities.
