Speaker
Description
First-order phase transitions (1st-order PT) have been described in the magnetized Nambu--Jona-Lasinio (NJL) model when the anomalous magnetic moment (AMM) of quarks is included at zero temperature. The AMM quark effect is a consequence of the dynamical chiral symmetry breaking for massive quark in the nonperturbative Quantum Chromodynamics (QCD) regime. The Lattice QCD has described the inverse magnetic catalysis, the decrease of the quark condensate as function of the magnetic field close to the pseudocritical temperature, which was also found in some effective models with quark AMM. Working with a two-flavor NJL model under magnetic field with the quark AMM included by the Pauli term and applying the vacuum magnetic regularization scheme, based on magnetic field independent regularization, we show that these 1st-order PT are regularization artifacts related with mass-dependent terms in the potential. We regain the Schwinger--Weisskopf one-loop effective potential as we constrain the magnetic field to be smaller than the squared of the effective quark mass.
