Do nuclear collisions create a locally equilibrated quark–gluon plasma?
Do nuclear collisions create a locally equilibrated quark–gluon plasma?
复制标题
DOI：
10.1140/epjc/s10052-016-4567-x
复制
发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
P. Romatschke
中科院分区：
文献类型：
--
作者：
P. Romatschke
高能核碰撞（核-核、质子-核和质子-质子）中方位相关的实验结果似乎可以用粘性流体力学很好地描述。人们常常认为，这种一致性要么意味着局部热平衡，要么至少意味着局部各向同性。在这篇文章中，我提出了为什么情况并非如此的论据。流体力学既不需要局部近平衡，也不需要近各向同性，以便成功和准确地描述实验结果。然而，我预测流体力学在7倍于温度的动量下的破裂，对应于最小可能的QCD液滴大小为0.15 fm。
Experimental results on azimuthal correlations in high energy nuclear collisions (nucleus–nucleus, proton–nucleus, and proton–proton) seem to be well described by viscous hydrodynamics. It is often argued that this agreement implies either local thermal equilibrium or at least local isotropy. In this note, I present arguments why this is not the case. Neither local near-equilibrium nor near-isotropy are required in order for hydrodynamics to offer a successful and accurate description of experimental results. However, I predict the breakdown of hydrodynamics at momenta of order seven times the temperature, corresponding to a smallest possible QCD liquid drop size of 0.15 fm.