求解宇宙的动力学
Solving for the dynamics of the universe
摘要：
提出了一种求解空间均匀各向同性宇宙的Einstein-Friedmann动力学方程的新方法。当物质含量的状态方程为P=（g-1）ρ，g =常数时，该方法是适用的。当曲率指数K为1或-1时，膨胀因子的解通常仅针对g = 0、1和4/3给出。建议的程序是有效的一般g和K，它允许容易推导的解决方案。这种替代方法是有用的教学介绍基本宇宙学。
英文摘要：
A new method of solving the Einstein-Friedmann dynamical equations of a spatially homogeneous and isotropic universe is presented. The method is applicable when the equation of state of the material content assumes the form P=(g -1) rho, g = constant. The solution for the expansion factor is commonly given only for g = 0, 1 and 4/3 when the curvature index K is 1 or -1. The proposed procedure is valid for general g and K and it allows for ease of derivation of the solutions. This alternative method is useful pedagogically to introduce basic cosmology.
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