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private_messaging comments on Against Devil's Advocacy - Less Wrong
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Since there is a good deal of literature indicating that our own world has a surprisingly tiny probabilty (ref: any introduction to the Anthropic Principle), I try not to dismiss the fate of such "fringe worlds" as completely unimportant.
army1987's argument above seems very good though, I suggest you look at his comment very seriously
Asteroid belt got all the atoms to make the cake from, the only issue is their arrangement, and they're presently arranged in a specific configuration that is as unlikely - as low amplitude - as if they were arranged into a bunch of cakes. It's just that the highly unlikely configurations that look like asteroids are far more numerous than ones that look like cakes (which is a property of the looks-like-cake function).
Basically, it's a common fallacy to believe that coin toss sequence such as HHHHHHH is less probable than HTTHHTH. It isn't, and if you were to throw a quantum coin in a quantum many-worlds universe, the world where it was all heads will have same amplitude as every other sequence's world.
(Also, any "stray flows of amplitude" require non-linear Schrödinger's equation, of a very very specific kind so that you don't end up with essentially one world)