Efeitos do momento magnético anômalo na matéria de quarks

Abstract

This work aims to investigate the effect of anomalous magnetic moment (AMM) of quarks in the NJL and PNJL two-flavor models at finite temperature, chemical potential, and magnetic field. To achieve this, we employed the Schwinger’s linear in magnetic field ansatz and a VMR regularization scheme to treat ultraviolet divergences. We used an approximation in which the quark AMM is constant. In both models, when the chemical potential is zero with finite AMM, we observed a small window of IMC, eB ≈ 0.1 GeV2 , for chiral symmetry restoration, while the deconfinement transition is minimally affected by the finite AMM. When the chemical potential is finite, we observed that with finite AMM, increasing the magnetic field delays the onset of the critical point for chiral symmetry restoration. We also found that at high chemical potentials (µ > 0.29 GeV), the effect of AMM on the deconfinement transition is to increase the critical temperature of deconfinement. Finally, we observed that the finite AMM leads to a suppression of thermodynamic quantities around the chiral restoration temperature. Additionally, we observed an increase in the anisotropy between the pressures parallel and perpendicular to the magnetic field when the AMM is finite.