  In this note we summarize some of the results found recently in
hep-th/0609054. We show the pure discretness of the non-perturbative quantum
spectrum of a symplectic Yang-Mills theory defined on a Riemann surface of
positive genus, living in a target space that, in particular, can be 4D. This
theory corresponds to the membrane with central charges. The presence of the
central charge induces a confinement in the phase at zero temperature. When the
energy rises, the center of the group breaks and the theory enters in a
quark-plasma phase after a topological transition, corresponding to the N=4
wrapped supermembrane.
