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Another relativistic dynamics question

  1. Apr 15, 2010 #1
    Could someone please either derive or point me towards a derivation of the Lorentz invariance of action?

  2. jcsd
  3. Apr 18, 2010 #2
    Thought I'd give this one bump before it left the front page altogether..
  4. Apr 18, 2010 #3


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    I don't think it's derived so much as required. You could write down a non-Lorentz invariant action, but you wouldn't want to, because the resulting theory would lack Lorentz invariance, which is firmly established experimentally.
  5. Apr 19, 2010 #4
    So if a theory includes action that isn't Lorentz invariant, then it will inevitably have something else in it that's also not Lorentz invariant and is required to be according to the initial hypotheses of special relativity?
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