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In QFT Lagrangian what is the potential energy exactly? 
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#1
Jan912, 07:51 AM

P: 159

if I have χψ*ψ term in the Lagrangian, the scattering ψψ→ψψ behaves as if we had a potential (nonrel. 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 renormalization? Thank!! 


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