On Fri, Oct 4, 2019 at 4:49 PM smitra <[email protected]> wrote: > On 04-10-2019 00:51, Bruce Kellett wrote: > > > > The trouble I see with the explanation Sabine gives, which is probably > > the most common response to this question, is that it dilutes the > > energy in each branch according to the Born weight. Given that there a > > zillions of branchings per second throughout the visible universe, the > > energy rapidly is weighted away to zero in all branches. This does not > > make much sense. Besides, that is not what one does in ordinary > > quantum mechanics -- I have no idea what Sabine is referring to here. > > > > The only solution for MWI, it seems to me, is that the energy is > > simply conserved in each branch, and not conserved over branching > > interactions. How would you ever test this, anyway? Block universe > > ideas do not actually help here. And appeals to energy non > > conservation in non-stationary universes are beside the point -- > > Quantum mechanics is not GR. > > > > The block universe point of view makes this a non-issue. You get into > trouble by assuming something like presentalism, like a hidden > assumption about the energy of one instant being transferred to the next > instant.
The thing is that this is what the conservation of energy says -- the total energy of the system at time t' > t is the same as the total energy at time t. It has nothing to do with presentism or any such metaphysical position. > If you drop this assumption and simply take thew block universe > point of view where all the instances already exist out there, then > there is no problem to begin with. > This would seem to be equivalent to the claim that energy is conserved separately in each branch. Again, the block universe view does nothing to assist such an interpretation, it merely shows that energy is not constant over the "block" -- from one time slice to the next -- given that the branching structure of the block defines a time direction. Why, on this view, the energy should be conserved in each disjoint branch is rather opaque. 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 view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLRgWKw%3DR%2BRdQZMPUR%3DKVkHmkwbYRcO58wCZReTS56OgMA%40mail.gmail.com.
