Dirac propagator
= Dirac propagator
The free <Dirac propagator> is $S_F(p)=i(\not p+m)/(p^2-m^2+i\epsilon)$ and inverts the Dirac kinetic operator with Feynman <boundary conditions>.
= Dirac propagator
The free <Dirac propagator> is $S_F(p)=i(\not p+m)/(p^2-m^2+i\epsilon)$ and inverts the Dirac kinetic operator with Feynman <boundary conditions>.