Scientific note
Spectral Density of the Causal Propagator
The causal propagator (or Pauli-Jordan function), which multiplied by i is the spacetime commutator of the field [ phi (x), phi (x')], plays an essential role in scalar quantum field theory.
Scientific note
The causal propagator (or Pauli-Jordan function), which multiplied by i is the spacetime commutator of the field [ phi (x), phi (x')], plays an essential role in scalar quantum field theory.