Large Nc Deconfinement Transition in the Presence of a Magnetic Field
  We investigate the effect of a homogeneous magnetic field on the thermal deconfinement transition of QCD in the large $N_c$ limit. First we discuss how the critical temperature decreases due to the inclusion of $N_f \ll N_c$ flavors of massless quarks. Then we study the equivalent correction in the presence of an external Abelian magnetic field. To leading order in $N_{f}/N_{c}$, the fact that the deconfinement critical temperature decreases with the magnetic field depends solely on quarks behaving paramagnetically. Finally, we discuss the effects from a finite quark mass and its competition with magnetic effects. 
Eduardo S. Fraga, Jorge Noronha and Leticia F. Palhares
hep-ph hep-lat hep-th nucl-th