On 07 Jun 2016, at 11:03, Bruce Kellett wrote:
On 7/06/2016 6:57 pm, Bruno Marchal wrote:
On 07 Jun 2016, at 04:24, Bruce Kellett wrote:
That is just playing with words, and Deutsch's approach reduces
the concept of "separate worlds" to meaninglessness -- the concept
becomes so fluid as to become useless. One is very much better
advised to limit the idea of separate worlds to the
irreversibility following a decohered interaction.
That does not exist. In principle quantum erasure is always
possible. In practice that is quickly impossible, but reason of BIG
numbers, but the wave, or the unitary evolution, is always
reversible.
That is false. As I explained earlier in the post, decoherence into
the warm thermal environment will always result in IR photons.
These escape at the velocity of light and can never be captured
to be returned -- this is an in principle limitation on the
possibility of reversibility. Reversibility is possible only in very
special and tightly controlled situations. In general, the formation
of distinct worlds is irreversible in principle.
No problem with this.
In "my" theory (which is the "physics of the average classical Löbian
machine" and is extracted from pure arithmetic) we still don't know if
there are photons. All we know is that there is a highly symmetrical
core bottom which determines the measure on the observable and on the
*many* relative accessible first person sharable histories, and that
this obeys some quantum logic.
Bruno
Bruce
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