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The difference between big delta and small delta?

  1. Jul 14, 2011 #1
    Could anybody explain me what's the difference between [itex]\delta\Gamma^{\rho}_{\mu\nu}[/itex] and [itex]\Delta\Gamma^{\rho}_{\mu\nu}[/itex]? Thank you
     
  2. jcsd
  3. Jul 14, 2011 #2
    The first usually refers to a variation of the quantity, also used in linearized gravity.
    The latter is just the Laplacian:

    [itex]\Delta=\partial_{\mu}\partial^{\mu}[/itex].
     
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