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> one in which the rules for macro systems and quantum systems are completely different and quantum systems collapse into a state consistent with the rules for
by kgwgk 4y ago
> one in which the rules for macro systems and quantum systems are completely different and quantum systems collapse into a state consistent with the rules for macro systems when they interact with a macro system -- and one where there is only the one set of rules and no collapse
... and no clear relation with the states that we observe as it includes no rules defining macro systems?
- ummonk 4y agoThe size at which the outside world starts leaking into the system (and vice versa) in short timespans is pretty well defined both theoretically and experimentally, especially because quantum decoherence is a major annoyance to address in quantum computing.
- kgwgk 4y agoThere is no outside world in the "universal wavefunction" theories.
- ummonk 4y agoHuh? The universal wavefunction doesn't preclude you from modeling isolated systems with their own independent wavefunction. I.e. Psi(world) = Psi(system)*Psi(outside world). The extent to which you can model a system as truly isolated depends on its size and quality of quantum isolation. This can be calculated theoretically as well as measured empirically.
- kgwgk 4y agoIf the universal wave function Psi(everything-in-this-universe-and-beyond) can be factorized as Psi(system)*Psi(everything else) then the state of the system is precisely defined. Isn’t the universal wavefunction supossed to be able to accomodate distinct realities where that system may be in different states?
- ummonk 4y agoYou seem to be under the impression that either a simplified model perfectly describes the world or it is useless.
- kgwgk 4y agoThe question was whether you can describe the world with a “single set of rules” that doesn’t address at all the question of how to relate that “single-rule meta-world” with the world you try to describe.