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If the universe is deterministic, how can there be entanglement or branching at all? What need is there for a multiverse if you have determinism? It’s as if no

If the universe is deterministic, how can there be entanglement or branching at all? What need is there for a multiverse if you have determinism? It’s as if non-determinists aren’t sure that 2 doesn’t act like a 3 sometimes because of decoherence and so 2 + 3 = 6 as a result. Where am I going wrong in this line of thinking? How could randomness be injected into a system without superpositioning of quarks? Is that literally the only way? Is Hawking radiation the smoking gun we think it is? Edit: I admit I am tired when posting but this topic is perhaps one of the most fascinating of all. I can’t stay away.

paulddraper 7y ago
The waveform is deterministic. It does not "collapse" to a randomly chosen value; it continues to be all the values in perptuity. It's like matrix multiplication: yes you can wind up with more elements after the operation, but the result as a whole is entirely deterministic. If you defined matrix multiple multiplication where you collapsed the result down to a single unspecified vector, then you would have "randomness" (according to the selection). Many worlds says "don't choose"; keep the entire matrix, and the results will get larger and larger. The universe is not fundamentally rolling dice, though it appears that way from your perspective since you can only see a single slice of the matrix.