Early Universe Leptogenesis in a Bottle

We describe an experiment and theory of a chirped non-linear optical process in a warm vapor cell of Rubidium that is the phenomenological "clone" of early universe leptogenesis, the proposed process which created a matter excess. Broken CP symmetry in this optical context is spectral asymmetry in the lineshape resulting from the combined spectral density of the Rubidium level scheme and the doppler detuning. Chirp speed plays the role of the Hubble expansion rate. We detail several key experimental inovations which made this correspondence clear and place this study in the broader context of the response of systems with broken discrete symmetries that are driven off of equilibrium.