The Master Ward Identity for Scalar QED

  title={The Master Ward Identity for Scalar QED},
  author={Michael D{\"u}tsch and Luis Peters and Karl-Henning Rehren},
  journal={arXiv: Mathematical Physics},
It is emphasized that for interactions with derivative couplings, the Ward Identity (WI) securing the preservation of a global gauge symmetry should be modified. Scalar QED is taken as an explicit example. More precisely, it is rigorously shown in scalar QED that the naive WI and the improved Ward Identity ("Master Ward Identity", MWI) are related to each other by a finite renormalization of the time-ordered product ("T-product") for the derivative fields; and we point out that the MWI has… 
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