论文标题
动力气体宇宙
The kinetic gas universe
论文作者
论文摘要
比流体方法更基本的许多粒子系统的描述是将它们视为动力气体。在这种方法中，系统的性质编码的动力变量是位置和速度空间中气体颗粒的分布，称为1粒子分布函数（1PDF）。但是，当动物气体的重力场通过爱因斯坦 - 弗拉索夫方程得出时，将有关气体颗粒速度分布的信息取消并因此丢失。我们建议直接从其1pdf中得出动力气体的重力场，从而完全考虑了速度分布。我们猜想这种精致的方法可能可以解释观察到的黑能现象学。
A description of many-particle systems, which is more fundamental than the fluid approach, is to consider them as a kinetic gas. In this approach the dynamical variable in which the properties of the system are encoded, is the distribution of the gas particles in position and velocity space, called 1-particle distribution function (1PDF). However, when the gravitational field of a kinetic gas is derived via the Einstein-Vlasov equations, the information about the velocity distribution of the gas particles is averaged out and therefore lost. We propose to derive the gravitational field of a kinetic gas directly from its 1PDF, taking the velocity distribution fully into account. We conjecture that this refined approach could possibly account for the observed dark energy phenomenology.
