The purpose of the talk is to introduce a new development of the quantum field theory that we have called “The observable-state model” [1,2], which consists in the description of the perturbation expansion of the correlation functions in terms of mean values of observables on particular quantum states. The main advantage of this development is the renormalization procedure, that can be described as a projection operation which removes the short-distance singularities of the quantum states, leaving any correlation function finite even if the interacting Lagrangian is not renormalizable.

[1] J. S. Ardenghi, M. Castagnino, Phys, Rev. D. 85, 12, 025002, 2012

[2] J. S. Ardenghi, M. Castagnino, Phys, Rev. D, 85, 15, 125008, 2012.