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I understand energy-momentum tensor with contravariant indices, where

  1. May 7, 2013 #1
    I understand energy-momentum tensor with contravariant indices, where

    I think I get [itex]T^{αβ}[/itex], but how do I derive the same result for [itex]T_{αβ}[/itex]? Why are the contravariant vectors simply changed to covariant ones, and why does it work in Einstein's equation?
     
  2. jcsd
  3. May 8, 2013 #2

    Dick

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    You just lower indices by multiplying both sides of Einstein's equation by the metric tensor, you don't just 'change them'. I'm not sure what you don't understand.
     
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