On Sunday, July 29, 2018 at 3:08:50 AM UTC-5, Bruno Marchal wrote: > > > On 28 Jul 2018, at 20:36, Lawrence Crowell <goldenfield...@gmail.com > <javascript:>> wrote: > > In the deBroglie-Bohm interpretation the counterfactual does not exist. > > > Here I disagree. They continue to exist in the potential so that it guides > the particles correctly. It is empty of particles but still mimic a world > with particles from the point of view of possible observers (lacking > particles). The branches without particles must still mimic their internal > observers correctly to guide correctly the particles. I agree with Deutsch > when he says that the deBroglie-Bohm theory is a many-worlds theory, with > one branches “more real” (having particles), and the other branches > mimicked by the guiding potential. With mechanism, we cannot know if we are > in the worlds with the particles or without, unless we postulate, as Bohm > did, some non mechanist theory of mind. > > > > > There is in that idea on active channel for the motion of the ontic > particle.In ψ-epistemic interpretations it is odd to talk about > counterfactuals existing or for that matter anything factual prior to the > measurement of decoherence. As I have indicated QM is most likely neither > purely ψ-ontic or ψ-epistemic, so to talk about anything "existing" is a > bit strange. > > In the deBroglie-Bohm interpretation there are active and empty channels. If you want you might define empty channels as counterfactuals, but maybe with a different sense than the factual of an empty channel.
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