In QFT Lagrangian what is the potential energy exactly?

  1. if I have χψ*ψ term in the Lagrangian, the scattering ψψ→ψψ behaves as if we had a potential (non-rel. limit) Exp(-mr)/r.
    but when I try to calculate the expectation value of χψ*ψ in any state I get zero.
    is that a different kind of potential energy? does it have to do with re-normalization?

    Thank!!
     
  2. jcsd
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