On Tue, Nov 25, 2014 at 2:08 AM, Bruce Kellett <bhkell...@optusnet.com.au> wrote:
> meekerdb wrote: > >> >> ISTM there are two ways of looking at it. In one you say before the >> event there were several possibilities x,y,z,... with probabilites >> a,b,c,... and one of them, x, happened. The energy before x was the same >> as after x, so energy is conserved. In the other you say x happened with >> probability a in the multiverse, y happened with probability b in the >> multiverse, z happened with probability c in the multiverse,... And in >> each of x,y,z energy was conserved and since a+b+c+...=1 energy is >> conserved in the multiverse. Non-conservation only appears when you use >> these two pictures inconsistently. >> > > This seems to be the same as the renormalization that Wilczek talks about > -- you essentially re-weight energies in the same way as you re-weight > probabilities. > > > If you mean by re-weighting the energies that the particles in different branches have different energies, then for example if the particle were a photon, each branch would have a photon of a different frequency. That would make MWI chaotic. But if each branch has the same photon at the original frequency, energy is not conserved. OTOH if there is a probability that a branch will not happen, which is always the case with renormalization, then that's pretty close to a wave collapse. With renormalization there is a probability that no branch will happen. That also leads to chaos. Richard > From an instrumentalist viewpoint (which I think can be useful) "energy" >> is just the conjugate variable of "time". We want our theories to apply at >> all times so we seek formulations of energy and time that do this as simply >> as possible. Having a conserved quantity called "energy" is a consequence >> of having theories that apply uniformly in time. >> > > Without local energy conservation QM, on which MWI is based, is in real > trouble. > > Bruce > > > -- > 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 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
