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Thomas comments on A note on the description complexity of physical theories - Less Wrong
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How does the Multiverse know, I am just sleeping for 24 (or 24000) hours? How the Multiverse knows, I'll not be rescued after the real suicide attempt after a quantum coin head popped up?
Or resurrected by some ultratech?
Where is the fine red line, that the Quantum Immortality is possible, but a Quantum Awakening described above - isn't?
It doesn't, not right now in the present moment. But there's no reason why "subjective threads" and "subjective probabilities" should depend on physical laws only locally. Imagine you're an algorithm running on a computer. If someone pauses the computer for a thousand years, afterwards you go on running like nothing happened, even though at the moment of pausing nobody "knew" when/if you'd be restarted again.
But what if a new computer arises every time and an instance of this algorithm start there?
As it allegedly does in MW?
Because you won't be back. Universe has the whole eternity to just wait for you to come back. If you don't, the only remaining ones that keep on experiencing from where you left off are the branches where coin didn't come heads.
I see. The MW has a book of those who will wake up and those who will not?
And acts accordingly. Splits or not.
I do not buy this, of course.
It's a good thought to reject.
In fact, quantum immortality has little to do with the actual properties of the universe, as long as it's probabilistic. It's just what happens when you arbitrarily (well, anthropically) decide to stop counting certain possibilities.
No, it always splits into two everett branches. It's just that if you do in fact wake up in the distant future, that version of you that wakes up will be a successor of the you that is awake now, as is the version of you that never went to sleep in the next microsecond (or whatever). And you should anticipate either's experiences equally.
Or at least that's how I think it works (this assumes timeless physics, which I think is what Jonii assumed).