if you have a sufficient density of superintelligences you can reverse the computation done by the universe itself which is pretty crazy isnt it yeah it is anyway this has practical consequences for ai cooperation problems so your decision theory should be able to handle it if your decision theory doesnt suck the end result can end up looking like qm with a nonrandom collapse postulate if superintelligences reverse computations in a way that is not identical to the born rule ie they prefer worlds where magical unicorns exist or whatever
Let me try to parse and respond:
Yes, it seems possible that a superintelligence embedded in the world can exert enough control to reverse the universe's computation. I don't think density is the relevant notion, and there are confusing issues going on here (which have certainly been touched on at LW). It is not clear that this sort of reversal is possible.
Yes, it seems like reversing the universe's computation may be useful under a broad range of circumstances, though ai cooperation is not high on the list for me--recovering negentropy the universe has al...
This post may be interesting to some LWers.
In summary: it looks like our universe can support reversible computers which don't create entropy. Reversible computers can simulate irreversible computers, with pretty mild time and space blowup. So if moral value comes from computation, negentropy probably won't be such an important resource for distant future folks, and if the universe lasts a long time we may be able to simulate astronomically long-lived civilizations (easily 10^(10^25) clock cycles, using current estimates and neglecting other obstructions).
Has this been discussed before, and/or is there some reason that it doesn't work or isn't relevant? I suspect that this consideration won't matter in the long run, but it is at least interesting and seems to significantly deflate (long-run) concerns about entropy.