Vacuum Stability in two-Higgs doublet models (2009)
Sa, Nuno Barros E, Barroso, Augusto, Ferreira, Pedro, Santos, Rui
In this work we review the status of tree-level vacuum stability in general two-Higgs doublet models. We also discuss the problem of Normal minima in some classes of potentials. In some of these...
Uncertainty for spin systems (2000)
A modified definition of quantum mechanical uncertainty D for spin systems, which is invariant under the action of SU(2), is suggested. Its range is shown to be h^2j
Decomposition of Hilbert space in sets of coherent states (2000)
Within the generalized definition of coherent states as group orbits we study the orbit spaces and the orbit manifolds in the projective spaces constructed from linear representations. Invariant...
Hamiltonian analysis of General relativity with the Immirzi parameter (2000)
Starting from a Lagrangian we perform the full constraint analysis of the Hamiltonian for General relativity in the tetrad-connection formulation for an arbitrary value of the Immirzi parameter and...
A note on topological brane theories (2000)
Bengtsson, Ingemar, Sa, Nuno Barros E, Zabzine, Maxim
We consider the theory of closed $p$-branes propagating on $(p+1)$-dimensional space-time manifolds. This theory has no local degrees of freedom. Here we study its canonical and BRST structures of...
Geodesics or autoparallels from a variational principle? (1997)
Recently it has been argued that autoparallels should be the correct description of free particle motion in spaces with torsion, and that such trajectories can be derived from variational principles...