Thermo-magnetic effects in quark matter: Nambu--Jona-Lasinio model constrained by lattice QCD

Understand

The phenomenon of inverse magnetic catalysis of chiral symmetry in QCD predicted by lattice simulations can be reproduced within the Nambu--Jona-Lasinio model if the coupling~$G$ of the model decreases with the strength $B$ of the magnetic field and temperature~$T$.

• The thermo-magnetic dependence of $G(B,T)$ is obtained by fitting recent lattice QCD predictions for the chiral transition order parameter.
• Different thermodynamic quantities of magnetized quark matter evaluated with $G(B, T)$ are compared with the ones obtained at constant coupling, $G$.
• The model with $G(B,T)$ predicts a more dramatic chiral transition as the field intensity increases.