Ward - Takahashi Identity with External Field in Ladder QED ∗

نویسندگان

  • Efrain J. Ferrer
  • Vivian de la Incera
چکیده

We derive theWard-Takahashi identity obeyed by the fermion-antifermiongauge boson vertex in ladder QED in the presence of a constant magnetic field. The general structure in momentum space of the fermion mass operator with external electromagnetic field is discussed. Using it we find the solutions of the ladder WT identity with magnetic field. The consistency of our results with the solutions of the corresponding Schwinger-Dyson equation ensures the gauge invariance of the magnetic field induced chiral symmetry breaking recently found in ladder QED. ∗Supported by NSF grant PHY-9722059

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تاریخ انتشار 1998