Armok_GoB comments on Harry Potter and the Methods of Rationality discussion thread, part 8 - Less Wrong

8 Post author: Unnamed 25 August 2011 02:17AM

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Comment author: Armok_GoB 01 September 2011 01:51:21PM 4 points [-]

There's actually, unless I've made a stupid mistake, an even better algorithm that is Truing computable, if very slow:

every time the value of a bit may depend on future events, split the universe and calculate both possibilities. If a branch ever implies a paradox prune that branch and pretend it never happened.

Actually, while this indeed would require a ludicrous amount of branching for an universe where arbitrary chunks of matter can be transported back to any given plank time, all those branches would need to be computed anyway for MWI quantum mechanics. So all you're really doing is tweaking the MEASURE of each branch.

Comment author: AlexMennen 01 September 2011 07:31:47PM 2 points [-]

Hm... sounds right. This also has the fairly disturbing implication that, while people only ever remember consistent time loops, the distribution of mind-moments currently experiencing time loops is not weighted towards consistency, and thus most of them cease to exist as soon as the time travel event fails to happen in a way that would have formed a consistent loop.

Comment author: Armok_GoB 01 September 2011 08:10:34PM 1 point [-]

Yea, hehe. Reminds me of Mangled Worlds Quantum Mechanics: http://hanson.gmu.edu/mangledworlds.html

Basically the same thing, but with the born probabilities instead of temporal consistency. And the fact that it may very well be real. O_o