Indeed, to explain the fine tuning of both the initial conditions and the laws and constants of physics, the combination of inflationary cosmology and string theory needs to affirm numerous purely hypothetical entities, abstract postulates, and unobservable processes. In particular for an inflationary string landscape model to explain both types of fine tuning, it must make the following postulations: An inflaton field exists. The decay of inflaton fields will produce new bubble universes with different initial conditions. The process of inflation will continue eternally into the future. An
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