depending on the inflationary model, to produce a life-compatible universe the shutoff energy of the inflaton field requires fine tuning of between 1 part in 1053 and 1 in 10123. In addition, the shutoff interval of the inflaton field must also be precisely finely tuned. In current models, inflation begins at around 10−37 seconds after the big bang and ends about 10−35 seconds after the big bang, during which the radius of space itself expands by a factor of at least 1026.29
