The nonrelativistic limit for the Weyl quantized Hamlitonians and pseudo-differential operators.
The wave equation with one point interaction and the (linearized) classical electrodynamics of a point particle
Time as a quantum observable, canonically conjugated to energy, and foundations of self-consistent time analysis of quantum processes.
Time-space duality and Salam-Weinberg model
Two Hartree-Fock models for the vacuum polarization
We review recent results about the derivation and the analysis of two Hartree-Fock-type models for the polarization of vacuum. We pay particular attention to the variational construction of a self-consistent polarized vacuum, and to the physical agreement between our non-perturbative construction and the perturbative description provided by Quantum Electrodynamics.