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Homework Help: Divergence of Energy-momentum Tensor

  1. Oct 16, 2011 #1
    How do you prove that Maxwell's energy-momentum equation is divergence-free?
    I don't know whether or not I have to use Lagrangians or Eistein's tensor, or if there's a simlpler way of expanding out the tensor..


  2. jcsd
  3. Oct 16, 2011 #2
    I mean


  4. Oct 16, 2011 #3


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    Try writing [itex]F_{\mu\nu} = \partial_\mu A_\nu - \partial_\nu A_\mu[/itex] and using the commutativity of the derivatives.
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