On 24 Nov 2014, at 23:07, Bruce Kellett wrote:
Bruno Marchal wrote:
On 24 Nov 2014, at 11:35, Richard Ruquist wrote:
With MWI thinking, every detector will detect a photon at the same
energy and frequency as the original photon but in a different
world. So the total energy in the multiverse will locally have
increased by the number of detectors times the photon energy. The
only way to conserve energy is to detect only one photon of the
same energy and frequency as the original photon.
... or the conservation of energy is something which has to be
accounted in branches, not in the multiverse.
I don't think so. The multiverse is described by the SWE, and that
is just a unitary transformation in Hilbert space. It satisfies
energy conservation by construction (time translation invariance and
Noether's theorem).
OK. I was wrong.
Then energy conservation is true only in the average branches. That
might provide a QM explanation why there is a universe with some
energy "in there".
You have to renormalize in each branch to get the observed branch-
wise energy conservation -- conservation is automatic only for the
multiverse.
OK, that confirms my feeling that conservation of probabilities is
related to conservation of energy (and information).
I took a look on Wilczek, and I think he is right, at least assuming
QM is 100% correct (but in that case we can in principle recover
whatever fall in a black hole, and GR needs to be changed. Is that not
what most people believe?).
Bruno
Bruce
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