  Topological charge changing transitions can induce chirality in the
quark-gluon plasma by the axial anomaly. We study the equilibrium response of
the quark-gluon plasma in such a situation to an external magnetic field. To
mimic the effect of the topological charge changing transitions we will
introduce a chiral chemical potential. We will show that an electromagnetic
current is generated along the magnetic field. This is the Chiral Magnetic
Effect. We compute the magnitude of this current as a function of magnetic
field, chirality, temperature, and baryon chemical potential.
