  In a recent paper[1] Kundu and one of the present authors showed that there
were transient but observable CP violating effects in the decay of classical
currents on the horizon of a black hole, if the Lagrangian of the Maxwell field
contained a CP violating angle {\theta}. In this paper we demonstrate that a
similar effect can be seen in the quantum mechanics of QED: a non-trivial Berry
phase in the QED wave function is produced by in-falling electric charges. We
also investigate whether CP violation, of this or any other type, might be used
to produce the baryon asymmetry of the universe, in models where primordial
black hole decay contributes to the matter content of the present universe.
This can happen both in a variety of hybrid inflation models, and in the
Holographic Space-time (HST) model of inflation[2].
