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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2005.13561gr-qcastro-ph.COhep-th
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动力气体宇宙

The kinetic gas universe

Manuel Hohmann, Christian Pfeifer, Nicoleta Voicu

摘要:

对多粒子系统的一种描述,比流体方法更基本,是把它们看作一种动力气体。在这种方法中,系统的属性被编码的动力学变量是气体粒子在位置和速度空间中的分布,称为单粒子分布函数(1 PDF)。然而,当通过Einstein-Vlasov方程导出动力气体的引力场时,关于气体粒子的速度分布的信息被平均掉,因此丢失。我们建议直接从动力气体的1 PDF导出其引力场,并充分考虑速度分布。我们推测,这种改进的方法可能解释所观察到的暗能量现象。

英文摘要:

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.

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