On Sunday, November 23, 2014 9:52:23 AM UTC, Bruce wrote: > > LizR wrote: > > On 22 November 2014 09:31, Richard Ruquist <[email protected] > <javascript:> > > <mailto:[email protected] <javascript:>>> 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..... > exactly -- 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.
