The main motivation of many worlds, that I can see, is that it doesn't require collapse. With collapse, you have a system that's behaving according to quantum mechanical rules and then, at particular arbitrarily defined times, the general rules of quantum mechanics suddenly stop working and everything resolves to a singular value. Many worlds says, how about the rules of quantum mechanics just keep working, all the time, without ever stopping? Everything is quantum mechanical, measurement is a quantum mechanical process, and instead of treating measurement as this unique break of the rules, we just keep on applying qm to the thing that was measured, and the thing that's measuring it, and the person that reads that measurement and so on - that's the central idea to many worlds.Iwannaplato wrote: ↑Mon Jul 24, 2023 1:53 pmI thought the main motivation was that it preserved determinism.Atla wrote: ↑Mon Jul 24, 2023 1:38 pm Why not? Most scientists are realists, and when we take QM literally, as a totally real thing, imo we probably end up with an extradimensional framework. The MWI imo was the first, rather inept attempt at an extradimensional interpretation, but it's often associated with nonsense like splitting universes and locality.
It's just sort of a happy consequence that that also happens to maintain (a very unique kind of) determinism. It's a unique kind of determinism because it's indistinguishable from randomness from the inside - it's like a weird meta determinism.