标题： 宇宙学中物质组分衰减快于辐射的情况 显示英文标题

标题： Cosmology with the matter component decaying faster than radiation

摘要： 快速衰减的质量-能量成分对宇宙演化的影响被研究，该成分随着尺度因子的增加而比辐射衰减得更快。 从哈密顿形式出发，得到了宇宙膨胀速度和加速度作为共形时间函数的流体动力学类似方程。 该快速衰减成分对宇宙膨胀动力学的影响由其对系统总能量密度的贡献符号决定。 这些影响通过图表进行了说明。 显示英文摘要

摘要： The impact of a fast decaying component of mass-energy, that decreases faster than radiation with the increase of the scale factor, on the evolution of the universe is studied using a hydrodynamic approach. Proceeding from the Hamiltonian formalism, the hydrodynamic-like equations for the velocity and acceleration of the expansion of the universe as a function of conformal time are obtained. The influence of a fast decaying component on the dynamics of the expansion of the universe is determined by the sign of its contribution to the total energy density of the system. The effects of this component are illustrated by figures.