Dynamics of a classical gas including dissipative and mean-field effects
Dynamics of a classical gas including dissipative and mean-field effects
复制标题
经典气体动力学，包括耗散效应和平均场效应
DOI：
10.1103/physreva.68.043608
复制
发表时间：
2003
影响因子：
2.9
通讯作者：
S. Stringari
中科院分区：
文献类型：
--
作者：
P. Pedri;D. Gu'ery;S. Stringari
通过缩放模拟，我们研究了经典气体的 Boltzmann-Vlasov 方程的近似解。在这个框架内，我们推导了谐波捕获气体的集体振荡的频率和阻尼，并研究了捕获释放后其膨胀。该方法非常适合研究系统中发生的碰撞效应，特别是讨论流体动力学和无碰撞状态之间的交叉。与集体振荡的阻尼和膨胀相关的弛豫时间之间建立了明确的联系。
By means of a scaling ansatz, we investigate an approximated solution of the Boltzmann-Vlasov equation for a classical gas. Within this framework, we derive the frequencies and the damping of the collective oscillations of a harmonically trapped gas and we investigate its expansion after releasing of the trap. The method is well suited to study the collisional effects taking place in the system and in particular to discuss the crossover between the hydrodynamic and the collisionless regimes. An explicit link between the relaxation times relevant for the damping of the collective oscillations and for the expansion is established.