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Gauge corvariant derivative

  1. Aug 16, 2007 #1
    I was wonder why some textbooks define it as D_u=d_u-ieA_u and other textbooks define it as D_u=d_u+ieA_u. I am not clear whether this choice doesn't matter or is one notation correct.
  2. jcsd
  3. Aug 19, 2007 #2


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    It's not relevant, it"s simply a matter of convention and convenience. It has to do with the connection between "e" and the value of the electric charge of the electron.
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