“If quantum computing actually materializes, in the sense that it’s a large scale, reliable computing option for us, then we’re going to enter a completely different era of simulation,” Davoudi says. “I am starting to think about how to perform my simulations of strong interaction physics and atomic nuclei if I had a quantum computer that was viable.”
All of these factors have led Davoudi to speculate about the simulation hypothesis. If our reality is a simulation, then the simulator is likely also discretizing spacetime to save on computing resources (assuming, of course, that it is using the same mechanisms as our physicists for that simulation). Signatures of such discrete spacetime could potentially be seen in the directions high-energy cosmic rays arrive from: they would have a preferred direction in the sky because of the breaking of so-called rotational symmetry.
Telescopes “haven’t observed any deviation from that rotational invariance yet,” Davoudi says. And even if such an effect were to be seen, it would not constitute unequivocal evidence that we live in a simulation. Base reality itself could have similar properties.
Here is further discussion from Anil Anathaswamy. Via Robert Nelsen. As you may already know, my view is that there is no proper external perspective, and the concept of “living in a simulation” is not obviously distinct from living in a universe that follows some kind of laws, whether natural or even theological. The universe is simultaneously the simulation and the simulator itself! Anything “outside the universe doing the simulating” is then itself “the (mega-)universe that is simultaneously the simulation and the simulator itself.” etc.