Eric Hawthorne writes:
> One of the issues is the computational complexity of "running all the 
> possible i.e. definable programs" to
> create an informational multiverse out of which consistent, metric, 
> regular, observable info-universes
> emerge. If computation takes energy (as it undeniably does WITHIN our 
> universe), then an unfathomably
> impossibly large amount of "extra-universal" energy would be required to 
> compute all info-universes.

This is an interesting posting, and I'll try to write more about it later.
I do have one objection, which is that computation actually does not
take energy within our universe.  Reversible computing is a model for
doing computation with arbitrarily small amounts of energy.

Now, I'm not sure whether that actually makes a difference in the
plausibility of an abstract computational engine grinding away on all
programs simultaneously and creating all possible universes.  I don't
think anyone intends this to be taken literally enough that we should
worry about where the energy, matter, time and space come from which
such a computer might need.  Whether computation inherently uses energy
or not may doesn't seem that relevant.

Hal Finney

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