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Energy-momentum tensor, lagrangian density

  1. May 14, 2014 #1
    1. The problem statement, all variables and given/known data

    I try to calculate the energy tensor, but i cant do it like the article, and i dont know, i have a photo but it dont look very good, sorry for my english, i have a problem with a sign in the result

    2. Relevant equations



    3. The attempt at a solution

    In the photos you can see the attemp at a solution
     

    Attached Files:

  2. jcsd
  3. May 14, 2014 #2
    This is the problem
     

    Attached Files:

  4. May 14, 2014 #3
    I must get the yellow (3) from yellow in (2)
     
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