论文标题
宇宙早期阶段的热力学和宇宙学参数
Thermodynamic and cosmological parameters of early stages of the Universe
论文作者
论文摘要
早期宇宙的特征是存在在不同温度下脱钩的重颗粒，从而导致宇宙的不同阶段。这对热力学的时间演变和表征早期宇宙的每个阶段的宇宙学参数产生了影响。在这项研究中，我们得出了在宇宙早期的时代，辐射时代，夸克 - 格洛隆等离子体时代，强子时代和混合时代的时代，得出这些参数时间演变的方程式的分析表达式。所关注的参数包括能量密度，熵密度，温度，除哈勃参数和比例因子之外的压力。拥有这些表达式，我们可以估计与本工作所呈现的与宇宙每个时代开始和结束相对应的时间。
The early Universe was characterized by the presence of heavy particles that decoupled at different temperatures leading to different phases of the Universe. This had a consequences on the time evolution of the thermodynamic and the cosmological parameters characterizing each phase of the early Universe. In this study, we derive the analytic expressions of the equations governing the time evolution of these parameters in the early eras of the Universe namely, the radiation era, the quark-gluon plasma era, the hadron era and the mixed era. The parameters under concern include the energy density, the entropy density, the temperature, the pressure in addition to Hubble parameter and the scale factor. Having these expressions allows us to give estimations of the times corresponding to the beginning and ending of each era of the Universe as will be presented in this work.
