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The constant mean extrinsic curvature on a spacelike slice may constitute aphysically preferred time coordinate, `York time'. One line of enquiry to probethis idea is to understand processes in our cosmological history in terms ofYork time. Following a review of the theoretical motivations, we focus onslow-roll inflation and the freezing and Hubble re-entry of cosmologicalperturbations. We show how the mathematical account of these processes isdistinct from the conventional account in terms of standard cosmological orconformal time. We also consider the cosmological York-timeline more broadlyand contrast it with the conventional cosmological timeline.

Cosmological history in York time: inflation and perturbations