Cosmological history in York time: inflation and perturbations
  The constant mean extrinsic curvature on a spacelike slice may constitute a
physically preferred time coordinate, `York time'. One line of enquiry to probe
this idea is to understand processes in our cosmological history in terms of
York time. Following a review of the theoretical motivations, we focus on
slow-roll inflation and the freezing and Hubble re-entry of cosmological
perturbations. We show how the mathematical account of these processes is
distinct from the conventional account in terms of standard cosmological or
conformal time. We also consider the cosmological York-timeline more broadly
and contrast it with the conventional cosmological timeline.
