Out-of-equilibrium chiral magnetic effect and momentum relaxation in holography

We compute anomalous transport phenomena sourced by vector and axial magnetic fields in out-of-equilibrium setups produced by Vaidya background metrics in holography. We use generalized Vaidya metrics that include momentum relaxation induced by massless scalar fields. While the background metric and gauge field show formally instantaneous thermalization, the chiral magnetic effect has significantly large equilibration times. We study how the equilibration of the chiral magnetic effect depends on the length of the Vaidya quench and the momentum relaxation parameter. These results shed some light on aspects of the chiral magnetic effect in out-of-equilibrium situations such as the quark gluon plasma produced in heavy ion collisions.