We determine the free energy of strongly interacting matter as a function of an applied constant and uniform magnetic field. We consider Nf=2+1 QCD with physical quark masses, discretized on a lattice by stout improved staggered fermions and a tree-level improved Symanzik pure gauge action, and we explore three different lattice spacings. For magnetic fields of the order of those produced in noncentral heavy ion collisions (eB∼0.1 GeV2), strongly interacting matter behaves like a medium with a linear response, and is paramagnetic both above and below the deconfinement transition, with a susceptibility which steeply rises in the deconfined phase. We compute the equation of state, showing that the relative increase in the pressure due to the magnetic field gets larger around the transition and is of the order of 10% for eB∼0.1 GeV2.
Magnetic susceptibility and equation of state of Nf=2+1 QCD with physical quark masses
BONATI, CLAUDIO;D'ELIA, MASSIMO;MARITI, MARCO;
2014-01-01
Abstract
We determine the free energy of strongly interacting matter as a function of an applied constant and uniform magnetic field. We consider Nf=2+1 QCD with physical quark masses, discretized on a lattice by stout improved staggered fermions and a tree-level improved Symanzik pure gauge action, and we explore three different lattice spacings. For magnetic fields of the order of those produced in noncentral heavy ion collisions (eB∼0.1 GeV2), strongly interacting matter behaves like a medium with a linear response, and is paramagnetic both above and below the deconfinement transition, with a susceptibility which steeply rises in the deconfined phase. We compute the equation of state, showing that the relative increase in the pressure due to the magnetic field gets larger around the transition and is of the order of 10% for eB∼0.1 GeV2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
