抱歉我終於好像想起來了,特開一篇好了 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. 我剛剛只記得他是神父而已 http://en.wikipedia.org/wiki/Georges_Lema%C3%AEtre 其實宇宙學反而數學簡單裡面後來用到的都是大一微積分而已,困難的是想出這些天才 的變換,這裡面蠻多天才的數學變換都是掛名字的 --

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