  In this work we present the general differential geometry of a background in
which the space-time has both torsion and curvature with internal symmetries
being described by gauge fields, and that is equipped to couple spinorial
matter fields having spin and energy as well as gauge currents: torsion will
turn out to be equivalent to an axial-vector massive Proca field and because
the spinor can be decomposed in its two chiral projections, torsion can be
thought as the mediator that keeps spinors in stable configurations; we will
justify this claim by studying some limiting situations. We will then proceed
with a second chapter, where the material presented in the first chapter will
be applied to specific systems in order to solve problems that seems to affect
theories without torsion: hence the problem of gravitational singularity
formation and positivity of the energy are the most important, and they will
also lead the way for a discussion about the Pauli exclusion principle and the
concept of macroscopic approximation. In a third and final chapter we are going
to investigate in the light of torsion dynamics some of the open problems in
the standard models of particles and cosmology which would not be easily
solvable otherwise.
