Anomalous magnetic moment of hot quarks, inverse magnetic catalysis, and reentrance of the chiral symmetry broken phase

作者：Fayazbakhsh Sh^*; Sadooghi N

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, 90(10): 105030.

DOI：10.1103/PhysRevD.90.105030

The effect of the anomalous magnetic moment of quarks on thermodynamic properties of the chiral condensate is studied, using a two-flavor Nambu-Jona-Lasinio model at finite temperature T, chemical potential mu, and in the presence of a uniform magnetic field eB. To this purpose, the Schwinger linear-in-B ansatz for the anomalous magnetic moment of quarks is considered in terms of the nonperturbative Bohr magneton. In a two-dimensional flavor space, it leads to the correction (T) over cap (Sch) = (kappa) over cap (Q) over cap eB in the energy dispersion relation of quarks. Here, (Q) over cap is the quark charge matrix. We consider three different sets for (kappa) over cap ,and numerically determine the dependence of the constituent quark mass on T, mu, and eB for fixed (kappa) over cap. By exploring the complete phase portrait of this model in T - mu, mu - eB, and T - eB phase spaces for various fixed eB, T, mu, and (kappa) over cap, we observe that inverse magnetic catalysis occurs for large enough (kappa) over cap. Moreover, in the regime of weak magnetic fields, the phenomenon of reentrance of chiral symmetry broken and restored phases occurs for T-, mu-, and eB-dependent (mu) over cap.

• 出版日期2014-11-25