论文标题
平均场对放松时间近似中流体动力学的影响
Effects of the mean field on fluid dynamics in the relaxation time approximation
论文作者
论文摘要
在本文中，获得了包含时间和空间依赖质量的分布函数的非平衡校正。鉴于这一点，制定了完全一致的流体动态方程。然后，在松弛时间近似中详细阐述了块状粘度的物理学。发现量子气的比率$ζ/τ_r$的参数形式受红外截止的影响。这可能表明松弛时间近似太粗糙，无法获得可靠的散装粘度。
In this paper the nonequilibrium correction to the distribution function containing a time and space dependent mass is obtained. Given that, fully consistent fluid dynamic equations are formulated. Then, the physics of the bulk viscosity is elaborated for Boltzmann and Bose-Einstein gases within the relaxation time approximation. It is found that the parametric form of the ratio $ζ/τ_R$ for the quantum gas is affected by the infrared cut-off. This may be an indication that the relaxation time approximation is too crude to obtain a reliable form of bulk viscosity.
