Vorticity in the Early Universe
Christopherson, Adam (Queen Mary, University of London)

Vorticity is ubiquitous in nature however, to date, studies of vorticity in cosmology and the early universe have been quite rare. In this talk, I will consider vorticity generation from cosmological perturbations of a perfect fluid system. I show that, at second order in perturbation theory, vorticity generation is sourced by energy density and entropy gradients, and hence solely scalar perturbations. Such vorticity will likely be important for future CMB B-mode experiments.