“…[9,10,11] for recent discussions on this), the origin of the effect is essentially topological and so the CME is not renormalized even at strong coupling, as was shown by the holographic methods [12,13,14,15,16,17,18]. The evidence for the CME has been found in lattice QCD coupled to electromagnetism, both within the quenched approximation [19,20,21] and with light domain wall fermions [22]. Unlike the baryon chemical potential, the chiral chemical potential µ A does not present a "sign problem" which opens a possibility for lattice computations at finite µ A [4].…”