2 papers
quant-ph2000
Uncertainty for spin systems
Nuno Barros e Sa
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<D<h^2j(j+1) wi…
gr-qc1997
Geodesics or autoparallels from a variational principle?
Nuno Barros e Sa
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 vari…