Is there any way to prove/disprove we are in a computer simulation in some transcendental reality?
Even if we are "really" not in a simulation, can we ever prove so? Even if some messages/evidence flashing "You are in a simulation by an Overlord" pops up, can we always dismiss it as a naturalistic hallucination?
Can quantum mechanics apply to closed systems? MWI and consistent histories are candidates, but run into the preferred basis/choice of consistent histories problem. Copenhagen requires a transcendental observer and a Heisenberg cut, doesn't it? If there is a transcendental observer, doesn't that imply there has to be a transcendental realm? So, if our universe is a subsystem in some transcendental realm which can perform, and only perform, Turing computable computations, isn't that equivalent to saying our universe is a computer simulation in some transcendental realm? This doesn't necessarily imply there is some Overlord who is an Intelligent Designer Programmer. It could be an Overlord who is a "Blind Watchmaker" transcendental observer. This Overlord might be deist or an occasional interventionist.
In Copenhagen, in order for something to exist, it has to be observed, right? That means we need an "all-seeing eye in the sky" transcendental Overlord, right? If this Overlord forgets about us, we die, and pop out of existence, right?