标题： 由范德瓦尔斯流体和暗能量组成的宇宙学模型 显示英文标题

标题： Cosmological models described by a mixture of van der Waals fluid and dark energy

摘要： 宇宙被建模为一种二元混合物，其组分由范德华流体和暗能量密度描述。 暗能量密度被考虑为第五元素或查普利金气体。 考虑了涉及范德华流体与引力场之间能量传递的不可逆过程。 该模型可以模拟：(a) 一个暴胀时期，其中加速度呈指数增长，范德华流体表现得像暴胀子；(b) 一个暴胀时期，其中加速度为正但逐渐减小并趋于零，而范德华流体的能量密度衰减；(c) 一个减速时期，对应于具有非负压力的物质主导时期；以及 (d) 当前的加速时期，其中暗能量密度超过范德华流体的能量密度。 显示英文摘要

摘要： The Universe is modeled as a binary mixture whose constituents are described by a van der Waals fluid and by a dark energy density. The dark energy density is considered either as the quintessence or as the Chaplygin gas. The irreversible processes concerning the energy transfer between the van der Waals fluid and the gravitational field are taken into account. This model can simulate: (a) an inflationary period where the acceleration grows exponentially and the van der Waals fluid behaves like an inflaton; (b) an inflationary period where the acceleration is positive but it decreases and tends to zero whereas the energy density of the van der Waals fluid decays; (c) a decelerated period which corresponds to a matter dominated period with a non-negative pressure; and (d) a present accelerated period where the dark energy density outweighs the energy density of the van der Waals fluid.