| Popis: |
The canonical analysis of Proca's theory in five dimensions with a compact dimension is performed. From the Proca five dimensional action, we perform the compactification process on a S^1/\mathbf{Z_2} orbifold, then, we analyze the four dimensional effective action that emerges from the compactification process. We report the extended action, the extended Hamiltonian and the counting of degrees of freedom of the theory. We show that the theory with the compact dimension continues laking of first class constraints. In fact, the final theory is not a gauge theory and describes the propagation of a massive vector field plus a tower of massive KK-excitations and one massive scalar field. Finally, we perform the analysis of a 5D BF-like theory plus a Proca's term, we perform the compactification process and we find all constraints of the theory, we also carry out the counting of physical degrees of freedom; with these results, we conclude that the theory is not topological and has reducibility conditions among the constraints. |
