On 5/4/2018 8:01 PM, [email protected] wrote:
On Saturday, May 5, 2018 at 1:47:59 AM UTC, Brent wrote: On 5/4/2018 5:33 PM, [email protected] <javascript:> wrote:On Friday, May 4, 2018 at 9:44:49 PM UTC, Brent wrote: On 5/4/2018 12:07 PM, [email protected] wrote:Unfortunately, it is not the case that you can implement absolutely any unitary transformation in this way. For instance, you cannot implement the unitary transformation that would reverse a totally decohered event. *If the decoherence was unitary, why can't the process be reversed statistically, analogous to the case of the classical cooling gas where we imagine the hugely improbable incoming and absorption of the previously outgoing IR photons? AG*It's mathematically reversible, but it's not reversible by you or any combination of powers in this world no matter how magical because this world is orthogonal to other worlds that contain the information you would need to reverse it. Which is why I suggested this be called nomologically irreversible. Brent *I don't buy this argument. Since those other worlds don't exist, one cannot speak of information lost to them. AG *Then you can adopt the "disappearing worlds" interpretation and banish them. But then you're faced with the CI problem of exactly when and why they vanish. BrentWorlds which disappear must first exist, and the worlds of the MWI, like the "branches" of the SWE, don't exist.
Then you need some rule as to why they don't exist. They are all the same in the SWE solutions.
The answer IMO must lie with decoherence, or how a measurement choice is made. If it's made by any describable physical process, then the quantum world is determinate,
You mean if it's made by some deterministic physical process.
which I think is contradicted by Bell experiments.
If it's not random then a non-local hidden variable can be used to signal FTL.
So the quantum world must be irreducibly random, which is the same as saying that measurements are irreversible in principle. AG
Well you already assumed that in the first line. Throwing away the "branches" of the SWE is what CI does and that is throwing away information and makes it inherently irreversible.
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