On Saturday, May 5, 2018 at 1:47:59 AM UTC, Brent wrote: > > > > On 5/4/2018 5:33 PM, agrays...@gmail.com <javascript:> wrote: > > > > On Friday, May 4, 2018 at 9:44:49 PM UTC, Brent wrote: >> >> >> >> On 5/4/2018 12:07 PM, agrays...@gmail.com 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
