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Connection between four current and Noether current.

  1. Jan 17, 2012 #1
    Hi,
    I was wondering if someone could explain how the Noether current and four-current are connected.

    For context, I'm going through a derivation to show that local phase symmetry requires the electromagnetic field. I'm at a stage where the I have a Noether current of a complex field (for Klein-Gordon Lagrangian), the next bit of the derivation then says that the Noether current [itex]J^{\mu}=-i(\varphi\partial\varphi^{*}-\varphi^{*}\partial\varphi)[/itex] can be cancelled out if one includes the electromagnetic interaction term [itex]-eJ^{\mu}A_{\mu}[/itex] and then does a gauge transformation.

    How are the two J terms related, because it seems to say that the four-current is equal to the Noether current.

    Thanks,
     
  2. jcsd
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