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PrawnOfFate comments on Physicists To Test If Universe Is A Computer Simulation (link) - Less Wrong Discussion
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Unless our simulator are fooling us about the expense of computational power.
If the Flying Spaghetti Monster is running the simulation, it is non-falsifiable, but also not worth considering because he can just stick his noodley appendage in and undo any results he doesn't like anyway retroactively. Its not like we would know the difference.
For us to break the fourth wall, either our creators would have to desire it or be pretty bad at running simulations.
..like the ones in The Matri, who allowed its denizens to evolve to knowledge of virtual reality, rather than keeping them at a medieval level, or using the bio-energy of sheep...
But I am more interested in the epistemic mistake people keep making. People keep assuming that it is possible for simulatees to know what is going on outside the simulation (or, equivalently, that basic laws must be same).
"For us to break the fourth wall, either our creators would have to desire it or be pretty bad at running simulations."
There is also the possibility that, assuming we live in a simulation, the creators simply do not care or mind whether they are discovered or not. This would also leave open the possibility of breaking the fourth wall.
Deliberate "fooling" may not even be required. Are Redstone Computers colossal and slow because Notch was trying to deceive some Minecraft denizens? It seems to simply be a necessary fact of "emulation" that any computer built out of physics X is going to be no faster than the computer required to simulate physics X.