Recent content by dfttheory

  1. D

    U(1) Gauge symmetry

    I just realized that the discussions related to this may contain some of what I am looking for. I would be interested in any additional discussion about this. Thanks!
  2. D

    U(1) Gauge symmetry

    So, I have a basic/general question here. I understand that, for example, the QED Langrangian has U(1) gauge symmetry. I also understand that this means (when you have written the Lagrangian with the covariant derivative) that if you transform the wavefunction (\psi \rightarrow e^{i \theta (x)}...
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