On Tue, Nov 25, 2014 at 2:08 AM, Bruce Kellett <[email protected]> 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 [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.
