‘Copenhagen’ isn’t so much an interpretation as a relatively traditional, relatively authoritative body of physics slogans. Depending on which Copenhagenist you speak to, the interpretation might amount to Objective Collapse, or Operationalism, or Metaphysical Idealism, or Quietism. The latter three aren’t so much alternatives to MWI as alternatives to the very practice of mainstream scientific realism; and Objective Collapse is generally empirically distinct from MWI (and, to the extent that it has made testable predictions, these have always been falsified.)
Bohmian Mechanics is an alternative to the MWI family of interpretations that really does look empirically indistinguishable. But it’s about as different from Copenhagenism as you can get, and is almost universally dismissed by physicists. Also, it may not solve this problem; I haven’t seen discussion of whether the complexity of the BM pilot wave is likely to itself encode an overwhelming preponderance of mental ‘ripples’ that crowd out the moral weight of our own world. Are particles needed for complex biology-like structure in BM?
‘Copenhagen’ isn’t so much an interpretation as a relatively traditional, relatively authoritative body of physics slogans. Depending on which Copenhagenist you speak to, the interpretation might amount to Objective Collapse, or Operationalism, or Metaphysical Idealism, or Quietism. The latter three aren’t so much alternatives to MWI as alternatives to the very practice of mainstream scientific realism; and Objective Collapse is generally empirically distinct from MWI (and, to the extent that it has made testable predictions, these have always been falsified.)
Bohmian Mechanics is an alternative to the MWI family of interpretations that really does look empirically indistinguishable. But it’s about as different from Copenhagenism as you can get, and is almost universally dismissed by physicists. Also, it may not solve this problem; I haven’t seen discussion of whether the complexity of the BM pilot wave is likely to itself encode an overwhelming preponderance of mental ‘ripples’ that crowd out the moral weight of our own world. Are particles needed for complex biology-like structure in BM?