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Schwarzschild Metric Question again

  1. Feb 25, 2004 #1
    The Schwarzschild Metric is only valid for R>2M, What are the units used here? Obviously R and M should have incompatible units...so how can any comparison of this type be made?
  2. jcsd
  3. Feb 26, 2004 #2


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    We can only externally check its validity down to that limit, but that does not mean that it is only valid down to that limit.

    In Plank units among other systems c = 1 and G = 1. So 2GM/c^2 = 2M. Specifically which system was used was up to whoever the author was.
  4. Feb 26, 2004 #3


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    Science Advisor

    There are extensions of the Schwarzchild solution for R<2M in other coordinates. R=2M is only a coordinate singularity, not a physical one.
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