抱歉我终於好像想起来了,特开一篇好了 Lemaître coordinates http://en.wikipedia.org/wiki/Lema%C3%AEtre_coordinates Georges Lemaître was the first to show that this is not a real physical singularity but simply a manifestation of the fact that the static Schwarzschild coordinates cannot be realized with material bodies inside the gravitational radius. Indeed inside the gravitational radius everything falls towards the centre and it is impossible for a physical body to keep a constant radius. . . . The Lemaître coordinate system is synchronous, that is, the global time coordinate of the metric defines the proper time of co-moving observers. The radially falling bodies reach the gravitational radius and the centre within finite proper time. 我刚刚只记得他是神父而已 http://en.wikipedia.org/wiki/Georges_Lema%C3%AEtre 其实宇宙学反而数学简单里面後来用到的都是大一微积分而已,困难的是想出这些天才 的变换,这里面蛮多天才的数学变换都是挂名字的 --

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