We will study the scalar quantum electrodynamics (sQED) by using Causal Perturbation Theory (TPC). In tree level we calculate the photon-boson and boson-boson scattering amplitude as well as vacuum polarization

In the present text we discuss some relations between the unitary evolution group generated by a self-adjoint operator defined in (...) and some fractal properties of its spectral measures. More precisely, we present some ...

The Schwinger quantum action principle is a dynamic characterization of the transformation functions and is based on the algebraic structure derived from the kinematic analysis of the measurement processes at the quantum ...