Hi Stephen,
On 15 Oct 2014, at 02:14, Stephen Paul King wrote:
Hi,
I re-read S. Mitra's paper again and it made more sense than
before if I assumed that the reversible measurement idea is to be
taken as a local reversal to the "direction of entropy flow" in an
area and not the entire universe.
The trouble is this notion of locality. Are there any favorite
definitions of "locality" out there? AFAIK, it does not have a fixed
size in space, but may have a fixed size in "space-time" as location
information expands at the speed of light if we ignore the effects
of local structure that would modulate decoherence. This
"decoherence" thing, IMHO, needs to be looked at carefully.
In deference to Bruno, I should ask a question relevant to the
ongoing discussions. Is a finite universe with locally reversible
time consistent as a 1p world?
If the 1p world are described by the []p & p move in arithmetic, then
it seems more plausible that they are antisymmetrical, in the finite
case, and non cyclical in the infinite case. This match the usual
phenomenology, I think. Locally, you can't negate the experience, when
you have a pain here and now, you can't negate the immediate memories.
Only a bad doctor would do that. It is like when you look up if you
are in Moscow or Washington, in the WM duplication. Once you see
Washington, that knowledge is not reversible *from* that knowledge
pov". At the 3p level, you can reverse locally by inducing an amnesia,
but that will not be part of the 1p experience.
Best,
Bruno
http://iridia.ulb.ac.be/~marchal/
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