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. > > Brent >
Worlds which disappear must first exist, and the worlds of the MWI, like the "branches" of the SWE, don't exist. 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, which I think is contradicted by Bell experiments. So the quantum world must be irreducibly random, which is the same as saying that measurements are irreversible in principle. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
