In order to make a simulation of the universe, you have to know the rules. Our study of physics makes it more believable we are in a simulation. The more we know, the better simulation can be made.
One of the main arguments that physicists use to talk about what's known as the "simulation hypothesis" is that if we can prove that it's possible to simulate a universe — if we can figure out all the laws that govern how everything works, which physicists are trying to do — that makes it much more likely that it is actually simulated. If we know that it's possible to do something, it's much easier to think that thing is being done.
Think about it this way. Chances are other forms of life have existed or do exist, and there's a good chance that some of them are smarter than us.
But Tyson uses a thought experiment to imagine a life-form that's as much smarter than us as we are than dogs, chimps, or other terrestrial mammals."What would we look like to them? We would be drooling, blithering idiots in their presence," he says.Whatever that being is, it very well might be able to create a simulation of a universe.
Critics say the assumptions needed to make the simulation theory work are not necessarily true. There is no real reason to think other, smarter beings exist and created this universe. Why would those beings even create a simulation of us? It might be a fun idea to bounce around, but it shouldn't be given serious consideration.
And the statistical argument that most minds in the future will turn out to be artificial rather than biological is also not a given, said Lisa Randall, a theoretical physicist at Harvard University. “It’s just not based on well-defined probabilities. The argument says you’d have lots of things that want to simulate us. I actually have a problem with that. We mostly are interested in ourselves. I don’t know why this higher species would want to simulate us.” Randall admitted she did not quite understand why other scientists were even entertaining the notion that the universe is a simulation. “I actually am very interested in why so many people think it’s an interesting question.” She rated the chances that this idea turns out to be true “effectively zero.”