Thermodynamic properties of QCD in external magnetic fields

Abstract

We consider the effect of strong external electromagnetic fields on thermodynamic observables in QCD, through lattice simulations with 1+1+1 flavors of staggered quarks at physical quark masses. Continuum extrapolated results are presented for the light quark condensates and for their tensor polarizations, as functions of the temperature and the magnetic field. We find the light condensates to undergo inverse magnetic catalysis in the transition region, in a manner that the transition temperature decreases with growing magnetic field. We also compare the results to other approaches and lattice simulations. Furthermore, we relate the tensor polarization to the spin part of the magnetic susceptibility of the QCD vacuum, and show that this contribution is diamagnetic.

13 pages, 9 figures, talks presented by FB and GE at Xth Quark Confinement and the Hadron Spectrum, 8-12 October 2012, TUM Campus Garching, Munich, Germany

References in corpus (7)

• QCD Phase Transition in a Strong Magnetic Background
• Superconductivity of QCD vacuum in strong magnetic field
• Chiral Properties of Strong Interactions in a Magnetic Background
• Two-color QCD with staggered fermions at finite temperature under the influence of a magnetic field
• Magnetic Susceptibility of the Quark Condensate and Polarization from Chiral Models
• Probing non-perturbative QCD through hadronic matrix elements extracted from exclusive hard processes
• Asymptotic freedom: history and interpretation