Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    Try writing [itex]F_{\mu\nu} = \partial_\mu A_\nu - \partial_\nu A_\mu[/itex] and using the commutativity of the derivatives.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook