> Il 27 maggio 2018 alle 8.37 [email protected] ha scritto: > > > > On Sunday, May 27, 2018 at 6:21:47 AM UTC, scerir wrote: > > > > > > > > > > > > > Il 27 maggio 2018 alle 6.05 Brent Meeker < > > [email protected]> ha scritto: > > > > > > > > > > > > On 5/26/2018 1:37 PM, [email protected] wrote: > > > > > > > > > > > > > > > > > > On Saturday, May 26, 2018 at 5:08:51 AM UTC, Brent > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > On 5/25/2018 9:50 PM, [email protected] wrote: > > > > > > > > > > > > > > > > Right. I was just making the > > > > > observation that when we don't see advanced EM waves (coming from the > > > > > future?), it's generally not seen as a big deal and they're ignored. > > > > > But when decoherence or the MWI implies the creation of full-blown > > > > > worlds (that we can't observe), there seems to be a large body of > > > > > opinion that accepts this bizarre result without serious criticism > > > > > that there's no mechanism or process for creating full-blown worlds. > > > > > No. I don't believe in such worlds. I tend to think a large segment > > > > > of professional physicists have gone mad. AG > > > > > > > > > > > > > > > > > Except you've got > > > > > > it backwards. There is a mechanism and process for creating them > > > > > > FAPP, evolution by the Schroedinger equation, which is the same > > > > > > process used in predicting results. But there is no physical > > > > > > mechanism for making them disappear....there's a mathematical > > > > > > process, i.e. taking the partial trace which is the same as > > > > > > applying a projection operator (with a little better justification). > > > > > > > > > > > > > > > > > > There's a distinction between subspaces that are > > > > disjoint and inaccessible to each other, and their non existence. > > > > Apparently you want to make the case that their mutual inaccessibility > > > > is equivalent to their non existence. > > > > > > > > > > > Operationally, it is. > > > > > > Brent > > > > > > > > Sometimes the principle of conservation of quantum > > > information (no-cloning, no-deleting) seems to have something to do with > > > MWI - conservation of quantum information and "relative state" > > > formulation both depend on linearity( ?) - in the sense that any other > > > world must be inaccessible (just to conserve quantum information). > > > > s. > > > > > > Is there an established result and general consensus in the physics > community that information is conserved in classical physics? In quantum > physics? Consider this a Yes or No question. AG >
http://www.scottaaronson.com/barbados-2016.pdf > > > > > > > > "In conclusion, we have shown that any theory for which dynamics is > > linear with respect to stochastic mixing, the no-cloning and no-deleting > > principles follow from the law of conservation of information, and from > > whether two copies contain a different amount of information than a single > > copy. In particular, this result allows us to understand the physical > > reason for which perfect cloning or > > deleting are impossible. They are forbidden because they infringe a > > principle of conservation of information. Classically, two copies and one > > copy contain the same information. However in the quantum case, these > > information contents are generically different, putting restrictions on > > cloning and deleting processes." > > > > https://arxiv.org/abs/quant-ph/0407038 > > https://arxiv.org/abs/quant-ph/0407038 > > > > see also, for entropy issues, > > https://arxiv.org/abs/quant-ph/0306044 > > https://arxiv.org/abs/quant-ph/0306044 > > > > > > > > > > > > > > > > > > -- > > > 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 > > > https://groups.google.com/group/everything-list . > > > For more options, visit https://groups.google.com/d/optout > > > https://groups.google.com/d/optout . > > > > > > > > > > > > > > > > -- > 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] > mailto:[email protected] . > To post to this group, send email to [email protected] > mailto:[email protected] . > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > -- 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.
