Question by daseinpbc: Do we have free will on the many worlds interpretation of quantum physics? And what do you mean by free will?
In terms of comparing the cophenhagen interpretation of free will with newtonian physics, the world is either deterministic or indeterministic. Can these words still apply to the many worlds interpretation of quantum physics? Because if the world is determined, free will doesnt make sense, and if the world is not determined and things are uncaused free will doesnt make sense. Its not that it exists or doesnt exist but the concept doesnt make sense. So can it make sense in the many worlds interpretation?

Best answer:

Answer by icarus62
As far as I can see, there is no such thing as free will. I base this on the trivial observation that you cannot choose what to think before you think it. Thoughts come into your mind unbidden, and you cannot choose what your next thought is going to be, because you would have to already be thinking of it in order to choose to think it, and that leads to an infinite regression.

Undoubtedly there is the influence of cause and effect – something happens to you, and you then think about it – and perhaps there is also a completely random element, but the same could be said of the weather, and we don’t say that the weather therefore has free will.

So, if we cannot choose what to think, then we cannot choose what to do either, since our actions are (generally) guided by our thoughts (and any action that is *not* guided by our thoughts wouldn’t be characterised as ‘will’ of any sort anyway).

Hence, as far as I can tell, free will does not exist.

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