Many physicists today regard the argument over fine tuning as “a wash.” Some leading physicists have told me—in all candor—that they regard the multiverse hypothesis as a speculative metaphysical hypothesis, not a scientific one.19 For them, since neither other universes nor God can be observed or measured, the choice between the two theories comes down to subjective preference.20 They would deny any evidential or theoretical reasons for preferring one hypothesis over the other. I’ve come to a different conclusion. Because both scientific and metaphysical hypotheses can be evaluated by
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