What are the alternatives to many-worlds?
There is no other quantum theory, besides many-worlds, that is scientific, in the sense of providing a reductionist model of reality, and free of internal inconsistencies, that I am aware of. Briefly here are the defects of the most popular alternatives: 1) Copenhagen Interpretation. Postulates that the observer obeys different physical laws than the non-observer, which is a return to vitalism. The definition of an observer varies from one adherent to another, if present at all. The status of the wavefunction is also ambiguous. If the wavefunction is real the theory is non-local (not fatal, but unpleasant). If the wavefunction is not real then the theory supplies no model of reality. (See “What are the problems with quantum theory?”) 2) Hidden Variables [B]. Explicitly non-local. Bohm accepts that all the branches of the universal wavefunction exist. Like Everett Bohm held that the wavefunction is real complex-valued field which never collapses. In addition Bohm postulated that there w
