Quark matter under strong magnetic fields in the Nambu--Jona-Lasinio   Model
  In the present work we use the large-$N_c$ approximation to investigate quark matter described by the SU(2) Nambu--Jona-Lasinio model subject to a strong magnetic field. The Landau levels are filled in such a way that usual kinks appear in the effective mass and other related quantities. $\beta$-equilibrium is also considered and the macroscopic properties of a magnetar described by this quark matter is obtained. Our study shows that the magnetar masses and radii are larger if the magnetic field increases but only very large fields ($\ge 10^{18}$ G) affect the EoS in a non negligible way. 
D.P.Menezes (1), M. Benghi Pinto (1), S.S. Avancini (1), A. Perez   Martinez (2), C. Providencia (3) ((1) Depto de Fisica - ...