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Divergence of einstein tensor

  1. Jun 18, 2011 #1
    I'm reading gravitation and having trouble with one of the exercises.

    aRab+bRgab is the general tensor

    the exercise asks to show that the divergence of this tensor vanishes if and only if b=-1/2a
    how do I go about solving this problem?
  2. jcsd
  3. Jun 18, 2011 #2
    Check this out: http://mathworld.wolfram.com/ContractedBianchiIdentities.html" [Broken]
    Last edited by a moderator: May 5, 2017
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