Mitchell Porter: “There is no relativistic formulation of Many Worlds; you just trust that there is...You also haven’t said anything about the one version of Many Worlds which does produce predictions—the version Gell-Mann favors, “consistent histories”—which has a distinctly different flavor to the “waves in configuration space” version.”
I think you are mistaken. It seems to me that consistent histories is basically just many worlds from a different point of view. Basically, both are standard QM with no collapse. In consistent histories you look at things from the point of view of path integrals instead of a wave equation. These are just two equivalent mathematical formalisms. Path integrals adapt more easily to the relativistic case, but it doesn’t seem to me that the interpretational issues are any different. Secondly, I’m not sure what you mean that consistent histories “produces predictions.” I’m pretty sure that consistent histories does not make any quantitative prediction that differs from standard quantum mechanics and quantum field theory.
Mitchell Porter: “There is no relativistic formulation of Many Worlds; you just trust that there is...You also haven’t said anything about the one version of Many Worlds which does produce predictions—the version Gell-Mann favors, “consistent histories”—which has a distinctly different flavor to the “waves in configuration space” version.”
I think you are mistaken. It seems to me that consistent histories is basically just many worlds from a different point of view. Basically, both are standard QM with no collapse. In consistent histories you look at things from the point of view of path integrals instead of a wave equation. These are just two equivalent mathematical formalisms. Path integrals adapt more easily to the relativistic case, but it doesn’t seem to me that the interpretational issues are any different. Secondly, I’m not sure what you mean that consistent histories “produces predictions.” I’m pretty sure that consistent histories does not make any quantitative prediction that differs from standard quantum mechanics and quantum field theory.