Call the following view Everettian libertarianism: Everything's determined by the initial conditions of the universe plus the Schrodinger equation to play out as it does, but you perform different actions (and thus have alternative possibilities open to you) in different branches of the wave function. In fact, you bring about every possible alternative action in some branch or other of the wave function. So: (i) everything is determined, and yet (ii) all alternative possibilities are open to you. So libertarian freedom and determinism are compatible after all.
Objection: That's not you in other branches of the wave function; those are just counterparts of you.
Reply: On a perfectly reasonable interpretation of the current scientific evidence, human beings are not single, numerically identical selves in a even a single world, whether at a given time or over time. So if the objection is based on some assumed requirement of numerical synchronic or diachronic personal identity for free will, then that assumption will equally undermine free will even if you only exist in one branch of the wave function. On the other hand, on a more relaxed account of personal identity (say, causal continuity or continuity of memory or personality), then all of your "counterparts" in various branches of the wave function are "you".
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