Holographic chiral currents in a magnetic field

Understand

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.