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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Heavy-Ion Collisions and QCD Phases III

HK 21.2: Talk

Tuesday, March 12, 2024, 16:00–16:15, HBR 62: EG 03

The Chiral Magnetic Effect in QCD with a non-uniform magnetic background — •Adeilton Dean Marques Valois, Eduardo Garnacho-Velasco, Gergely Endrodi, Bastian Brandt, and Gergely Markó — Bielefeld University, Bielefeld, Germany

We explore the impact of a non-uniform magnetic field background on the Chiral Magnetic Effect (CME) in QCD using lattice simulations with dynamical staggered quarks at the physical point. We show that, in the presence of magnetic field gradients, the system develops a localized vector current density along the direction of the field, which integrates to zero in the full volume. This demonstrates that the total CME-conductivity vanishes in QCD at equilibrium, even though steady currents can exist locally. Our primary observable is the leading-order coefficient of the vector current in a chiral chemical potential expansion. We extrapolate this observable to the continuum limit and discuss possible implications of our findings to heavy-ion physics.

Keywords: Lattice QCD; Chiral Magnetic Effect; Magnetic fields