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Jul 1, 2014 at 18:27 vote accept Freudian Slip
Jul 1, 2014 at 17:24 comment added John Rennie @StanLiou: I only chose the Schwarzschild metric because I could think of several coordinate systems for it. The FLRW metric would be a better example but as far as I know we only using comoving coordinates for this, or at least I've never seen a different coordinate system used. If you can think of a better example please shout!
Jul 1, 2014 at 17:22 comment added Stan Liou I feel that Schwarzschild geometry isn't a good example, because it is static, and hence there's a distinguished timelike direction, in this case Schwarzschild time. But the point certainly holds for most spacetimes.
Jul 1, 2014 at 17:12 comment added Zo the Relativist And, of course, there is the even more trivial problem that $R_{tttt}$ is always identically zero.
Jul 1, 2014 at 17:06 history answered John Rennie CC BY-SA 3.0