If Feynman could renormalize, why can't MWIers(;<) On Sun, Nov 23, 2014 at 4:52 AM, Bruce Kellett <[email protected]> wrote:
> LizR wrote: > >> On 22 November 2014 09:31, Richard Ruquist <[email protected] <mailto: >> [email protected]>> wrote: >> >> Collapse is necessary if you wish to conserve energy. >> >> I've been trying to follow this, but I still don't get why this is so, or >> thought to be so. Is there a simple explanation that even I can grasp? >> > > If you have a particle of a certain evergy and you measure its spin > projection, then in each world you get a certain result, but the particle > still carries all the energy of the original particle. So if there are two > possible spin states, then you have created two worlds, each of which has > all the energy of the original. That is the sense in which energy is not > conserved. > > The answer according to MWI advocates, at least as I have understood it, > is that just as probabilities have to be renormalized in each of the > daughter worlds, so does energy have to be renormalized. The probability of > spin up was 0.5 pre-measurement, but once you observe the result 'up', the > probability is renormalized to unity. Similarly, the energy could have been > expected to be 50% of the original, but renormalization restores this to > 100% in each world. > > If you believe in MWI, believing in this renormalization is not such a > stretch..... > > Bruce > > > > >> It seems to me that if you have fungible universes which diverge (as in >> FOR) then you already have a continuum of particles available, and these >> get shared out when the universes diverge. But they get shared out >> continuously - we have a continuum of universes and a continuum of >> particles... >> >> (At this point I try to follow what's happening and my head explodes, as >> in "Scanners") >> > > -- > 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 http://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 http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
