Scharf pioneered the application of causal perturbation theory to the rigorous construction of perturbative quantum field theories:

In his book

*Finite Quantum Electrodynamics – The Causal Approach*, Springer 1995

he discusses quantum electrodynamics this way, and in

*Quantum Gauge Theories – A True Ghost Story*, Wiley 2001

he discusses Yang-Mills theory, hence electroweak theory and quantum chromodynamics as well as perturbative quantum gravity.

On vacua/ground states of the free Dirac field in a Coulomb background field:

- Martin Klaus, Günter Scharf,
*The regular external field problem in quantum electrodynamics*, Helv. Phys. Acta**50**(1977) $[$doi:10.5169/seals-114890$]$

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