Exact Hydrodynamic Attractor of an Ultrarelativistic Gas of Hard Spheres.
Exact Hydrodynamic Attractor of an Ultrarelativistic Gas of Hard Spheres.
复制标题
硬球超相对论气体的精确流体动力吸引子。
DOI：
10.1103/physrevlett.124.152301
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发表时间：
2019
影响因子：
8.6
通讯作者：
J. Noronha
中科院分区：
文献类型：
--
作者：
G. Denicol;J. Noronha
在考虑粒子数守恒效应的情况下，导出了经历比约肯膨胀的超相对论性硬球气体粘性流体动力学方程的一般解析解，并用它来解析确定其后期吸引子。与之前考虑的涉及快速膨胀流体的所有情况不同，本例中梯度膨胀是收敛的。用具有全非线性碰撞核的玻尔兹曼方程来模拟该系统的微观动力学时，我们精确地确定了该系统的流体动力吸引子。当梯度较大时，用流体力学方法也能合理地描述该系统的精确的后期吸引子。
We derive the general analytical solution of the viscous hydrodynamic equations for an ultrarelativistic gas of hard spheres undergoing Bjorken expansion, taking into account effects from particle number conservation, and use it to analytically determine its attractor at late times. Differently than all the cases considered before involving rapidly expanding fluids, in this example the gradient expansion converges. We exactly determine the hydrodynamic attractor of this system when its microscopic dynamics is modeled by the Boltzmann equation with a fully nonlinear collision kernel. The exact late time attractor of this system can be reasonably described by hydrodynamics even when the gradients are large.
影响因子：
5
作者：
Bemfica, Fabio S.;Disconzi, Marcelo M.;Noronha, Jorge
通讯作者：
Noronha, Jorge
影响因子：
19.6
作者：
Aidala, C.;Akiba, Y.;Zou, L.
通讯作者：
Zou, L.