Holographic chiral currents in a magnetic field

Details Holographic chiral currents in a magnetic field Holographic chiral currents in a magnetic field

2010-07-15

arxiv.org/abs/1007.2494v1

Prog.Theor.Phys.Suppl.186:463-470,2010

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, to appear in the proceedings of "New Frontiers in QCD 2010", Yukawa Institute for Theoretical Physics, Kyoto, Japan,

Scientific paper

10.1143/PTPS.186.463

In the presence of a quark chemical potential, a magnetic field induces an axial current in the direction of the magnetic field. We compute this current in the Sakai-Sugimoto model, a holographic model which, in a certain limit, is dual to large-N_c QCD. We also compute the analogous vector current, for which an axial chemical potential is formally introduced. This vector current can potentially be observed via charge separation in heavy-ion collisions. After implementing the correct axial anomaly in the Sakai-Sugimoto model we find an axial current in accordance with previous studies and a vanishing vector current, in apparent contrast to previous weak-coupling calculations.

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