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  • (and that WOULD be silly, now wouldn't it?) one can actually look at spacetime from the perspective of the muon and then the clock runs at regular speed...
    120 KB (19,392 words) - 10:52, 23 May 2022
  • distance to be undefined in the absence of something to measure, either; spacetime itself is still parameterized by them even with nothing in it (and there's...
    448 KB (58,875 words) - 23:39, 30 January 2023
  • physically meaningful. Similarly the above argument outlined is that spacetime has to have physical energy-density and pressure terms in the stress tensor...
    214 KB (34,815 words) - 20:05, 27 June 2012