QUARK MATTER MAGNETIZATION: PHASE TRANSITION OR UPPER LIMIT OF MAGNETIC FIELD?

摘要

Quark matter is expected to exist in the interior of compact stellar objects as neutron stars or even the more exotic strange stars. In a previous paper [Int. J. Mod. Phys. D 14(11) (2005) 1959], the equations of state for a degenerate quark gas were studied in the presence of ultra strong magnetic fields, starting from the modified MIT Bag Model which included the electromagnetic interaction. In the present paper, we revise the behavior of a system made up of quarks with anomalous magnetic moment (AMM) and we discuss its effect in terms of the magnetization and susceptibility. It can be understood as a phase transition or as a criterion of the limited value for the magnetic field in quark stars.