On 11/21/2019 6:53 AM, John Clark wrote:
Reality, as the word is used by quantum physicists, means that after an interaction a physical object is always in one and only one state, so by that precise meaning of the word Many Worlds is not a realistic theory.
I don't understand why you write that. If there is multiverse, then the theory is that the mutliverse is a pure state (ray) in the Hilbert space of the multiverse and evolves per the Schroedinger equation alone.
To be in one unique state is only to say something is not in a mixed state. Any pure state is defined by a single ray in Hilbert space. The idea that things are in superpositions of states is just a consequence of picking the basis states in a way not aligned with the ray. We do this necessarily because in general we don't know the ray and because we are interested in what we will measure in the basis for which we can construct instruments.
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