  Quantum transport theory is used to calculate the nucleon spectral function
in infinite nuclear matter. A self-consistent description is obtained by
utilizing the relations between collision rates and correlation functions.
Static and dynamical self-energies are taken into account in the single
particle propagators. The real parts of the non-static self-energy
contributions are calculated by dispersion theory thus conserving the
analyticity of momentum distributions. The transport theoretical spectral
functions, momentum distributions, occupation probabilities and responce
functions are in close agreement with results of variational and other
many-body theoretical calculations. The results indicate that the nucleon
spectral functions are determined only by the average short-range correlation
strength.
