In the first place, as we’ve seen, the fine tuning of the inflation shutoff energies necessary to produce new habitable bubble universes ranges from between 1 part in 1053 and 1 part in 10123. Second, the fine tuning associated with the choice of inflationary models (and the various parameters specified in these models) is 1 part in 1066,000,000 as estimated by Carroll and Tam.
