In perturbative quantum field theory the term “Hadamard propagator” refers to the vacuum expectation value of the anticommutator of field observables:
(e.g. Calzetta 99, III.6, Millington 14 (7.29))
Beware that this is different from the concept of Hadamard 2-point function (“Wightman propagator”).
Esteban Calzetta, Stochastic dynamics of correlations in quantum field theory: From Schwinger-Dyson to Boltzmann-Langevin equation (arXiv:hep-ph/9903291)
Peter Millington, Thermal Quantum Field Theory and Perturbative Non-Equilibrium Dynamics, Springer 2014
Created on January 4, 2018 at 13:37:08. See the history of this page for a list of all contributions to it.